*'''Joystick''': Use the 4-way joystick to direct the red tank (or the blue tank if you're player 2, the yellow tank if you're player 3, and the green tank if you're player 4) around each round.
* '''Button''' - Shoots.
*'''Firing Button''': Use this button to make your tank fire shots at the enemies. If one player's tank shoots another player's tank, it will push the other player backwards one small tile.
*'''1, 2, 3 or 4 Player Buttons''': Push these buttons to begin the game as player 1, 2, 3 or 4.
==Players==
==Characters==
These are the tanks that the first and second players control. Player 1 controls the red tank, and player 2 controls the blue tank simultaneously. Depending on powerups they've collected, they can have one or two of their own shots on the screen at one time, and may not fire again until the shot(s) hits an enemy or collides with a wall. Unless a force field is surrounding the tanks or they've just spawned, preventing them from taking damage, they can be destroyed by one enemy bullet. If one player shoots another, it will kick the other player back to a distance of 1 small tile.
===The Players' Tanks===
[[File:TF 1P Tank.gif|left]]
[[File:TF 2P Tank.gif|left]]
[[File:TF 3P Tank.gif|left]]
[[File:TF 4P Tank.gif|left]]
The protagonists of the game. Player 1 controls the red tank, Player 2 controls the blue tank, Player 3 controls the yellow tank, and Player 4 controls the green tank. They can fire up to two shots on the screen at a time, and cannot fire again until one of their shots hits an enemy tank or a wall. Unless a force field is surrounding the players' tanks, they can be killed by one enemy bullet. As said above, if one player's tank shoots another player's tank, it will push the other player backwards one small tile, but it will not kill them.
{{-}}
==Regular Enemies==
===Normal Tanks===
[[File:TF Normal Tank.gif|left]]
These tanks are the first enemies you encounter in the game. Their bullets travel at the same speed as yours (without powerups). One hit will kill them, and they are worth 400 points.
{{-}}
===Basic Tank===
===Speed Tanks===
'''Points''': 400
[[File:TF Speed Tank.gif|left]]
These tanks are like the Normal Tanks, but can move somewhat faster. Their bullets however, will still travel at the normal speed. One hit will kill them, and they are worth 600 points.
{{-}}
This greenish tank is the first enemy you encounter. Their bullets travel at the same speed as yours (with no power-ups applied.) It takes one shot to destroy them.
===Hard Tanks===
[[File:TF Hard Tank.gif|left]]
These tanks move slower than the Normal Tanks and have the same firepower. They start out gray and turn redder each time they are hit. Three hits will kill them, and they are worth 1000 points. However, unlike other enemies which have multiple hit points in this game, they will slowly regenerate their full amount of hit points if they are not hit for a few seconds.
{{-}}
{{-}}
===Fast Tank===
===Big Tanks===
'''Points''': 600
[[File:TF Big Tank.gif|left]]
These are the slowest enemy tanks in the game. Five hits will kill them, and they are worth 1500 points; however, their flame-like shots can destroy walls with double firepower and it takes two hits to neutralize them, so it would be best to kill one when it is not facing you, because if it is facing you, you may not be able to neutralize its flame-shot in time.
{{-}}
This tank acts like a basic tank, but is significantly faster. They can move at a substantially faster rate than your tank can travel. Their bullets, however, travel at normal speed. It takes one shot to destroy them. Often they pose a considerable threat to your headquarters.
===Jeeps===
[[File:TF Jeep.gif|left]]
These are the fastest enemies in the game. Unlike the other enemies, they do not get stuck in the walls and when they hit a boundary of any sorts, they change direction to continue moving. They attack by laying sticks of dynamite which will explode and destroy any walls or kill any players that are in their vicinity. One hit will kill them, and they are worth 800 points.
{{-}}
{{-}}
===Armor Tank===
===Rapid Tanks===
'''Points''':1000
[[File:TF Rapid Tank.gif|left]]
These tanks move fairly slowly and warn you when they are about to fire on you, which also makes them vulnerable given that they will stop moving every time they do so. However, they attack by firing four fast-moving bullets at a time which can be very hard to neutralize and can result in a rather quick death. One hit will kill them, and they are worth 1200 points.
{{-}}
This tank moves a bit slower than a normal tank and has the same firepower. However, it takes three hits to destroy them. They start out bluish-gray and turn redder when hit. Third shot destroys them. Unlike other enemies with multiple hitpoints, they slowly regenerate their hits when not hit for some time.
===Tomahawk Tanks===
[[File:TF Tomahawk Tank.gif|left]]
Unlike the players' tanks and all the other enemies (which take up a space of 2 x 2 small tiles), these tanks take up a space of 4 x 4 small tiles. They will stop moving when firing but do not warn the players prior to their firing, unlike the Rapid Tanks. They attack by firing three missiles simultaneously. Each missile destroys tiles with double firepower. Their weakness is relative lack of mobility due to their slow speed and being only able to shoot downward. Eight hits will kill them, and they are worth 2000 points.
{{-}}
{{-}}
===Flame Tank===
===Train Cannons===
'''Points''':1500
[[File:TF Train Cannon 1.gif|left]]
[[File:TF Train Cannon 2.gif|right]]
This is the slowest enemy tank. However, it takes 5 shots to destroy it. Their shots destroys terrain with double firepower and it takes 2 shots to neutralize their projectile.
These diesel multiple-units appear as bosses on the fourth, twelfth, twentieth, and twenty-eighth rounds. The first type (shown in the image to the left), have one gun turret which is mounted on the centre of their roofs; eight hits will kill them, and they are worth 3000 points. The second type (shown in the image to the right) however, have two gun turrets mounted on either side of their roofs; sixteen hits will kill them, and they are worth 5000 points. Both types fire two fastmoving bullets from their gun turrets.
{{-}}
{{-}}
===Jeep===
'''Points''':800
This is the fastest enemy. Unlike other enemies, it doesn't get stuck in the wall and when it hits a boundary of any sorts, it changes direction to continue moving. Jeeps lay dynamites which explode and damage terrain or destroy players on or 1 small tile near them. Jeeps generally pose a small threat, but can be annoyance.
===Light Missile Launcher===
'''Points''':1200
Light missile launchers are fairly slow and warn player every time they're about to fire, making them also vulnerable. However, they shoot 4 bullets at a time which are very hard to neutralize and can make a quick game over when having a clear shot to even fully reinforced headquarters.
===Heavy Missile Launcher===
'''Points''':2000
Unlike other regular enemies and player tanks, which take a space of 2X2 small tiles, these take 4X4 small tiles. They stop when shooting but don't warn players prior to that, unlike light missile launchers. Heavy missile launchers shoot 3 missiles next to each other. Although most of them generally can't directly attack the headquarters, they can chip terrain away very quickly, opening up passages to smaller enemies, making them dangerous supporting vehicles. Their weakness is the fact that they can only shoot downwards, making them vulnerable from other locations. It takes 10 hits to destroy them.
==Bosses==
Every 4th stage is a boss stage. All bosses and their turrets move randomly left and right and take many hits to destroy. They are also able to shoot their projectiles so that it's impossible to destroy them from below. When bosses and their components are destroyed, the maximum amount of regular enemies onscreen typically increases.
===Light Armoured Wagon===
'''Points''': 3000
First encountered boss vehicle which has 1 turret in the center of it. These shoot projectiles similar to standard bullets, although these are sometimes not possible to destroy from below and travel at much faster speed. To destroy them, try to have protective cover both in left and right of you and move away as the center of the vehicle moves right above you.
===Heavy Armoured Wagon===
'''Points''': 5000
Much more dangerous than light armoured wagon. Has 2 turrets, 1 near the each end of the wagon.It's much harder to shoot them in safe range, especially when tank has 2 or more firepower upgrades since it's much safer to fire at it before moves directly above you.
This enormous tank appears as a boss on the eighth and sixteenth rounds. It has three rotary gun turrets mounted on its roof, which will each fire two fast-moving bullets at your tank while pointed downwards. Each of these turrets takes fifteen hits to destroy; the first one is worth 3000 points, the second one is worth 5000 points, and the third one is worth 10000 points. Once you have destroyed all three of the turrets, it will explode and disappear in a cloud of smoke.
A large vehicle with 3 turrets which must be destroyed to destroy the vehicle. Each of these turrets fire when they're pointed downwards so their attack pattern is somewhat predictable. Their projectiles resemble normal projectiles, but are significantly faster. When all the regular enemies are gone, it's advised to move as upwards as possible to minimize the time between shots and move away when turrets are starting to point downward.
{{-}}
===AK-2===
===AK-2===
'''Points''': ???
[[File:TF AK-2.gif|left]]
This enormous tank appears as a boss on the twenty-fourth and thirty-second rounds. It has four rotary gun turrets mounted on its roof which will each fire a flame-like shot (which is similar to those fired by the Big Tanks), at your tank while pointed downwards. However, each of these turrets only takes five hits to destroy; the first one is worth 3000 points, the second one is worth 5000 points, the third one is worth 8000 points, and the fourth one is worth 10000 points.
{{-}}
Second incarnation of AK vehicle is much more dangerous than the first one. It has 4 turrets which are more closely packed together than in AK-1. In addition, these turrets shoot projectiles similar to those which are shot by flame tank which means they take 2 shots to destroy. Fighting strategy is similar to AK-1, although harder to execute.
===Boss Cannons===
[[File:TF Boss Cannon.gif|left]]
Four of these enormous cannons appear as bosses on the thirty-sixth round, and attack by firing three missiles simultaneously. Each of them takes five hits to destroy; the first one is worth 10000 points, the second one is worth 15000 points, the third one is worth 20000 points, and the fourth one is worth 30000 points. However, when you kill one of them, the remaining ones will start to move faster - therefore, the last one that is remaining on the round will be moving very quickly and be very hard to hit as a result.
{{-}}
===Heavy Turret===
==Powerups==
'''Points''': ???
Destroying enemies will spawn powerups. Like [[Battle City]], predetermined enemies give powerups. However, the enemies which give powerups vary per level and do not look different from enemies which do not give powerups. For an example, powerups in the first round are spawned when 5th, 10th and 14th enemy (in their entering order) is destroyed.
*[[File:TF Powerup Bonus 500.gif]] [[File:TF Powerup Bonus 1000.gif]] [[File:TF Powerup Bonus 2000.gif]] [[File:TF Powerup Bonus 3000.gif]] '''Bonus''': These will add either 500, 1000, 2000 or 3000 extra points to your score. Given that points don't award extra lives in this game, they are basically only good for bragging rights.
*[[File:TF Powerup Shot.gif]] '''Shot''': These increase your tank's firepower, and their effects will wear off after you die. The first one collected allows you to fire four shots on screen at a time instead of just two, the second one collected increases the speed of your shots and the third one collected allows you to destroy steel blocks. Other temporary powerups may be affected by your firepower.
*[[File:TF Powerup 4-Way Shot.gif]] '''4-Way Shot''': This one will allow your tank to fire shots in all four directions for a short period of time, and is most effective against enemies approaching you from multiple directions.
*[[File:TF Powerup Hyper Shot.gif]] '''Hyper Shot''': This one will allow your tank to fire off bullets which move faster than normal, can penetrate walls quicker, and are very effective against bosses for a short period of time.
*[[File:TF Powerup Ripple Laser.gif]] '''Ripple Laser''': This one shares its name with a powerup from [[Salamander]] (which was the first game from [[Konami]] to use a Yamaha YM-2151 FM sound chip and a K007232 custom sound chip, but was the last to feature their "old" logo on the title screen), and will allow your tank to fire waves that cannot destroy walls but can kill enemies for a short period of time as each hit counts as up to 3 normal bullet hits.
*[[File:TF Powerup Twin Shot.gif]] '''Twin Shot''': This one will allow your tank to fire two shots which move faster than normal simultaneously, but the shot cannot destroy steel blocks even if you've three Shot powerups. It does not stack with Shot powerups.
*[[File:TF Powerup Small.gif]] '''Small''': This one will shrink your tank for a short period of time (which allows it to move around the rounds at a faster speed), but it does not make it any harder for the enemies to hit.
*[[File:TF Powerup Shield.gif]] '''Shield''': This one will create a temporary white force-field around your tank for a short period of time (which makes it invulnerable), but it will turn yellow when it is about to disappear.
*[[File:TF Powerup Bomb Attack.gif]] '''Bomb Attack''': This one will cause an enormous aeroplane to fly over the round and kill every enemy on the screen. The player who collected it will receive the points for every enemy. Note that players are invulnerable to enemies during this attack.
*[[File:TF Powerup Timer Stop.gif]] '''Timer Stop''': This one will freeze every enemy on the screen for a short period of time (and it is indicated by a clock-like song that is heard from the Yamaha YM-2151 during this time).
*[[File:TF Powerup Force Field.gif]] '''Force Field''': This one will create a barrier of steel blocks around the headquarters, for a short period of time (which will make it invulnerable to the enemies' shots), but it will wear off. In addition, it repairs the damage done to the base wall.
*[[File:TF Powerup Extend.gif]] '''Extend''': This one will give the player who collected it an extra life. This is the rarest powerup of all, but you should not go out of your way to collect it if the headquarters is under attack.
As a part of the final boss, these are extremely dangerous, shooting 3 missiles in a row so it's best to dodge these whenever possible. With each destroyed turret, the remaining ones start to move faster. The last remaining turret moves at great speed and is hard to hit.
==Environment==
==Power-Ups==
Often, when enemy is destroyed, a power up will appear semi-randomly on the screen when You must touch them to collect them and activate their effects.
{| {{prettytable}}
{| {{prettytable}}
! Power-up !! Description
!Environment !! Description
|-
|-
!Firepower
!Destructible terrain
|This upgrades your tank and their effects are only lost after dying. First upgrade allows 2 shots on-screen at the same time, second speeds up the projectile speed and third one allows to destroy steel blocks. Some of the temporary weapon power-ups are affected by player's firepower.
|Destructible terrain, consisting of buildings, bricks, etc. Stops tanks, other vehicles and bullets, but can be slowly destroyed. It takes 4 regular shots from one direction to destroy 2X2 size of destructible terrain.
|-
|-
!Points
!Gray stone
|These give you 500, 1000, 2000 or 3000 points to your score.
|Appears only in boss rounds 8 and 16. These stones require 50% as much shots to destroy than normal destructible terrain without maximized firepower.
|-
|-
!Base Fortification
!Blue stone
|Changes wall around headquarters to steel blocks for a short amount of time. In addition, any damage done to wall previously is repaired.
|Appears only in boss rounds 24, 32 and 36. These stones require twice as much shots to destroy than normal destructible terrain without maximized firepower.
|-
!Airstrike
|Destroys all enemies on-screen. Player receives points for every enemy destroyed.
|-
!Clock
|Stops all the enemy tanks for several seconds, allowing to harmlessly shoot them down. Sometimes even shooting down enemies right when they roll into stage is possible.
|-
!Shield
|Makes player invulnerable to enemy attacks for some time. Useful when rolling into the the fire line of enemies can destroy large amount of enemies within the short amount of time.
|-
!Tank
|Provides with extra life. These are very hard to come by.
|-
!Small tank
|Makes player significantly faster, making defending the headquarters and reaching power-ups easier. However, it does not make a player harder for the enemy to hit.
|-
!Double cannon
|Shoots 2 projectiles at the same time with faster speed. However, it can't destroy steel even when player has 3 firepower upgrades. Thus this power-up is generally not recommended for upgraded tanks, unless for purpose for breaking through non-steel terrain fast.
|-
!4-Way cannon
|Shoots in 4 directions at the same time. Effective in levels when it's required to take enemies down coming from multiple directions.
|-
!Power cannon
|Shoots powerful projectiles which are faster, pierce through terrain quickly and does more damage. Very effective against bosses.
|-
!Wave cannon
|Although not damaging terrain, this goes through everything, damaging every enemy in its path. This is one of the most useful weapons and allows to attack bosses harmlessly.
|}
==Environment==
{| {{Prettytable}}
!Environment !! Description
|-
!Destructible terrain
|Destructible terrain, consisting of buildings, bricks etc., stops tanks, other vehicles and bullets, but can be slowly destroyed. It takes 4 regular shots from one direction to destroy 2X2 size of destructible terrain. Some destructive terrain in same size in later levels takes 6 shots to destroy that way.
|-
|-
!Steel wall
!Steel wall
|Steel walls completely bullets and tanks like ordinary destructible terrain, but they can't be destroyed, unless a player's firepower has upgraded to maximum.
|Steel walls completely bullets and tanks like ordinary destructible terrain, but they can't be destroyed, unless a player's firepower has upgraded to maximum.
|-
!Base wall
|The wall that surrounds your headquarters. Only enemies can destroy it.
|-
|-
!Jungle
!Jungle
|Makes harder to see any objects under them.
|Makes it harder to see any objects under them.
|-
|-
!Water
!Water
Line 137:
Line 111:
|-
|-
!Gas tank
!Gas tank
|Gas tanks can be destroyed with 4 shots, bringing damage to any nearby enemies. They regenerate hitpoints when not hit. Enemies cannot destroy gas tanks.
|Gas tanks can be destroyed with 4 shots, bringing damage to any nearby enemies. They regenerate hit points when not hit. Enemies cannot destroy gas tanks. Gas tanks only appear in rounds 11 and 25.
There are 4 difficulty settings the arcade machine may be set - Easy, Normal, Hard and Very Hard. Difficulty affects the moving speed for the enemies and their projectiles. In very hard difficulty, enemies move over twice as fast as in easy mode. Slower enemies are affected more than faster ones.
Joystick: Use the 4-way joystick to direct the red tank (or the blue tank if you're player 2, the yellow tank if you're player 3, and the green tank if you're player 4) around each round.
Firing Button: Use this button to make your tank fire shots at the enemies. If one player's tank shoots another player's tank, it will push the other player backwards one small tile.
1, 2, 3 or 4 Player Buttons: Push these buttons to begin the game as player 1, 2, 3 or 4.
The protagonists of the game. Player 1 controls the red tank, Player 2 controls the blue tank, Player 3 controls the yellow tank, and Player 4 controls the green tank. They can fire up to two shots on the screen at a time, and cannot fire again until one of their shots hits an enemy tank or a wall. Unless a force field is surrounding the players' tanks, they can be killed by one enemy bullet. As said above, if one player's tank shoots another player's tank, it will push the other player backwards one small tile, but it will not kill them.
These tanks are the first enemies you encounter in the game. Their bullets travel at the same speed as yours (without powerups). One hit will kill them, and they are worth 400 points.
These tanks are like the Normal Tanks, but can move somewhat faster. Their bullets however, will still travel at the normal speed. One hit will kill them, and they are worth 600 points.
These tanks move slower than the Normal Tanks and have the same firepower. They start out gray and turn redder each time they are hit. Three hits will kill them, and they are worth 1000 points. However, unlike other enemies which have multiple hit points in this game, they will slowly regenerate their full amount of hit points if they are not hit for a few seconds.
These are the slowest enemy tanks in the game. Five hits will kill them, and they are worth 1500 points; however, their flame-like shots can destroy walls with double firepower and it takes two hits to neutralize them, so it would be best to kill one when it is not facing you, because if it is facing you, you may not be able to neutralize its flame-shot in time.
These are the fastest enemies in the game. Unlike the other enemies, they do not get stuck in the walls and when they hit a boundary of any sorts, they change direction to continue moving. They attack by laying sticks of dynamite which will explode and destroy any walls or kill any players that are in their vicinity. One hit will kill them, and they are worth 800 points.
These tanks move fairly slowly and warn you when they are about to fire on you, which also makes them vulnerable given that they will stop moving every time they do so. However, they attack by firing four fast-moving bullets at a time which can be very hard to neutralize and can result in a rather quick death. One hit will kill them, and they are worth 1200 points.
Unlike the players' tanks and all the other enemies (which take up a space of 2 x 2 small tiles), these tanks take up a space of 4 x 4 small tiles. They will stop moving when firing but do not warn the players prior to their firing, unlike the Rapid Tanks. They attack by firing three missiles simultaneously. Each missile destroys tiles with double firepower. Their weakness is relative lack of mobility due to their slow speed and being only able to shoot downward. Eight hits will kill them, and they are worth 2000 points.
These diesel multiple-units appear as bosses on the fourth, twelfth, twentieth, and twenty-eighth rounds. The first type (shown in the image to the left), have one gun turret which is mounted on the centre of their roofs; eight hits will kill them, and they are worth 3000 points. The second type (shown in the image to the right) however, have two gun turrets mounted on either side of their roofs; sixteen hits will kill them, and they are worth 5000 points. Both types fire two fastmoving bullets from their gun turrets.
This enormous tank appears as a boss on the eighth and sixteenth rounds. It has three rotary gun turrets mounted on its roof, which will each fire two fast-moving bullets at your tank while pointed downwards. Each of these turrets takes fifteen hits to destroy; the first one is worth 3000 points, the second one is worth 5000 points, and the third one is worth 10000 points. Once you have destroyed all three of the turrets, it will explode and disappear in a cloud of smoke.
This enormous tank appears as a boss on the twenty-fourth and thirty-second rounds. It has four rotary gun turrets mounted on its roof which will each fire a flame-like shot (which is similar to those fired by the Big Tanks), at your tank while pointed downwards. However, each of these turrets only takes five hits to destroy; the first one is worth 3000 points, the second one is worth 5000 points, the third one is worth 8000 points, and the fourth one is worth 10000 points.
Four of these enormous cannons appear as bosses on the thirty-sixth round, and attack by firing three missiles simultaneously. Each of them takes five hits to destroy; the first one is worth 10000 points, the second one is worth 15000 points, the third one is worth 20000 points, and the fourth one is worth 30000 points. However, when you kill one of them, the remaining ones will start to move faster - therefore, the last one that is remaining on the round will be moving very quickly and be very hard to hit as a result.
Destroying enemies will spawn powerups. Like Battle City, predetermined enemies give powerups. However, the enemies which give powerups vary per level and do not look different from enemies which do not give powerups. For an example, powerups in the first round are spawned when 5th, 10th and 14th enemy (in their entering order) is destroyed.
Bonus: These will add either 500, 1000, 2000 or 3000 extra points to your score. Given that points don't award extra lives in this game, they are basically only good for bragging rights.
Shot: These increase your tank's firepower, and their effects will wear off after you die. The first one collected allows you to fire four shots on screen at a time instead of just two, the second one collected increases the speed of your shots and the third one collected allows you to destroy steel blocks. Other temporary powerups may be affected by your firepower.
4-Way Shot: This one will allow your tank to fire shots in all four directions for a short period of time, and is most effective against enemies approaching you from multiple directions.
Hyper Shot: This one will allow your tank to fire off bullets which move faster than normal, can penetrate walls quicker, and are very effective against bosses for a short period of time.
Ripple Laser: This one shares its name with a powerup from Salamander (which was the first game from Konami to use a Yamaha YM-2151 FM sound chip and a K007232 custom sound chip, but was the last to feature their "old" logo on the title screen), and will allow your tank to fire waves that cannot destroy walls but can kill enemies for a short period of time as each hit counts as up to 3 normal bullet hits.
Twin Shot: This one will allow your tank to fire two shots which move faster than normal simultaneously, but the shot cannot destroy steel blocks even if you've three Shot powerups. It does not stack with Shot powerups.
Small: This one will shrink your tank for a short period of time (which allows it to move around the rounds at a faster speed), but it does not make it any harder for the enemies to hit.
Shield: This one will create a temporary white force-field around your tank for a short period of time (which makes it invulnerable), but it will turn yellow when it is about to disappear.
Bomb Attack: This one will cause an enormous aeroplane to fly over the round and kill every enemy on the screen. The player who collected it will receive the points for every enemy. Note that players are invulnerable to enemies during this attack.
Timer Stop: This one will freeze every enemy on the screen for a short period of time (and it is indicated by a clock-like song that is heard from the Yamaha YM-2151 during this time).
Force Field: This one will create a barrier of steel blocks around the headquarters, for a short period of time (which will make it invulnerable to the enemies' shots), but it will wear off. In addition, it repairs the damage done to the base wall.
Extend: This one will give the player who collected it an extra life. This is the rarest powerup of all, but you should not go out of your way to collect it if the headquarters is under attack.
Destructible terrain, consisting of buildings, bricks, etc. Stops tanks, other vehicles and bullets, but can be slowly destroyed. It takes 4 regular shots from one direction to destroy 2X2 size of destructible terrain.
Gray stone
Appears only in boss rounds 8 and 16. These stones require 50% as much shots to destroy than normal destructible terrain without maximized firepower.
Blue stone
Appears only in boss rounds 24, 32 and 36. These stones require twice as much shots to destroy than normal destructible terrain without maximized firepower.
Steel wall
Steel walls completely bullets and tanks like ordinary destructible terrain, but they can't be destroyed, unless a player's firepower has upgraded to maximum.
Base wall
The wall that surrounds your headquarters. Only enemies can destroy it.
Jungle
Makes it harder to see any objects under them.
Water
Water stops players and enemies, but projectiles can be fired over it.
Gas tank
Gas tanks can be destroyed with 4 shots, bringing damage to any nearby enemies. They regenerate hit points when not hit. Enemies cannot destroy gas tanks. Gas tanks only appear in rounds 11 and 25.
There are 4 difficulty settings the arcade machine may be set - Easy, Normal, Hard and Very Hard. Difficulty affects the moving speed for the enemies and their projectiles. In very hard difficulty, enemies move over twice as fast as in easy mode. Slower enemies are affected more than faster ones.
Bonus: These will add either 500, 1000, 2000 or 3000 extra points to your score. Given that points don't award extra lives in this game, they are basically only good for bragging rights.
Shot: These increase your tank's firepower, and their effects will wear off after you die. The first one collected allows you to fire four shots on screen at a time instead of just two, the second one collected increases the speed of your shots and the third one collected allows you to destroy steel blocks. Other temporary powerups may be affected by your firepower.
4-Way Shot: This one will allow your tank to fire shots in all four directions for a short period of time, and is most effective against enemies approaching you from multiple directions.
Hyper Shot: This one will allow your tank to fire off bullets which move faster than normal, can penetrate walls quicker, and are very effective against bosses for a short period of time.
Ripple Laser: This one shares its name with a powerup from Salamander (which was the first game from Konami to use a Yamaha YM-2151 FM sound chip and a K007232 custom sound chip, but was the last to feature their "old" logo on the title screen), and will allow your tank to fire waves that cannot destroy walls but can kill enemies for a short period of time as each hit counts as up to 3 normal bullet hits.
Twin Shot: This one will allow your tank to fire two shots which move faster than normal simultaneously, but the shot cannot destroy steel blocks even if you've three Shot powerups. It does not stack with Shot powerups.
Small: This one will shrink your tank for a short period of time (which allows it to move around the rounds at a faster speed), but it does not make it any harder for the enemies to hit.
Shield: This one will create a temporary white force-field around your tank for a short period of time (which makes it invulnerable), but it will turn yellow when it is about to disappear.
Bomb Attack: This one will cause an enormous aeroplane to fly over the round and kill every enemy on the screen. The player who collected it will receive the points for every enemy. Note that players are invulnerable to enemies during this attack.
Timer Stop: This one will freeze every enemy on the screen for a short period of time (and it is indicated by a clock-like song that is heard from the Yamaha YM-2151 during this time).
Force Field: This one will create a barrier of steel blocks around the headquarters, for a short period of time (which will make it invulnerable to the enemies' shots), but it will wear off. In addition, it repairs the damage done to the base wall.
Extend: This one will give the player who collected it an extra life. This is the rarest powerup of all, but you should not go out of your way to collect it if the headquarters is under attack.
