Warning Forever

Warning Forever is a freeware 2D shoot 'em up written by Hikoza T. Ohkubo and released under the name of his software house, Hikware.

Gameplay
The premise of the game is to fight a constant stream of bosses. The gameplay is broken into stages; each stage is a single boss battle. To progress to the next stage, the boss must be completely destroyed within the time limit. The game starts with a default time limit of 180 seconds (which can be changed to the maximum of 999 seconds in Options), with 30 seconds being gained for every boss defeated. 20 seconds are lost every time the player is destroyed.

The main gameplay feature is how the bosses change from stage to stage. Based on how you fight a boss, the next boss will adapt itself to defend against your strategies, and prey on your weaknesses. For example, if you destroy the front part of the boss first, it will increase armor on the front. Likewise, if you are killed by a certain kind of weapon, but still defeat the boss, the next boss will probably have more of that weapon.

The player flies a relatively small green ship. There are no powerups - the player's only weapon is a very rapid-fire revolving cannon which can fire in any direction, and widen or concentrate its projectile spread.

As is common in manic shooters, the area of the player's ship vulnerable to collisions is much smaller than the ship itself. This enables the ship to squeeze through small gaps.

Boss evolution
The initial form of the boss is called the Pure Heart. The Pure Heart will take on new characteristics in response to the player's assault.

The top and bottom halves will each choose a characteristic based on the method of attack the player uses against the four corner pieces of the boss:


 * Wide - Result of destroying the corner(s) from the side
 * Attack - Result of destroying the corner(s) from the top or bottom
 * Armor - Result of destroying attached parts before destroying the corner(s)

Once the Pure Heart chooses a top and bottom characteristic, its evolution path cannot be changed. The name of the boss at this point is derived from its top and bottom characteristics; for example, a Wide top and an Attack bottom results in a Wide Attacker but a Wide from both top and bottom results in a Wider.

Each of the three characteristics has two possible evolutions, one for the top and one for the bottom. The speed at which the Pure Heart evolves to this form depends on how consistent the player's attack pattern is.

Once both characteristics have evolved to this point, the boss will continue to evolve to its final form regardless of the player's attack pattern. There are nine possible evolution paths:

The Double Armor path does not evolve past ISE-ONE.

Boss parameters
Before each battle a chart pops up showing the strengths of the upcoming boss. There are six categories:


 * Front - Indicates forward strength
 * Rear - Indicates rear strength
 * Defense - Indicates defense
 * Core - Indicates strength of the core (the centre piece; destruction of the core destroys a boss)
 * Search - Indicates boss' ability to track down the player
 * Generator - Indicates quantity and speed of enemy gunfire

Weapons

 * Vulcan - Basic machine gun turrets. Stronger generator increases projectile amount and speed.
 * Laser - Laser cannons that shoot pink beams. Stronger generator increases duration and width of beams.
 * Cannon - Cannons that shoot a spread of blue balls. Stronger generator increases amount of shots per spread.
 * Smash - Turrets that shoot purple shotgun-style projectiles. Stronger generator increases projectiles fired.
 * Needle - Turrets that fire a stream of thin green bolts over a duration of time. Stronger generator extends the firing time.
 * Homing Missile - Homing missile launchers. Stronger generator increases duration of time in which the missile can home in towards the player, and the amount of missiles fired in one shot.

The bosses can also have thrusters with which they charge at the player; mobile arms; multidirectional spreading vulcan guns; and defensive shielding, which appears as a yellow glow.

The spreading and multi-directional vulcan guns can come from any piece that had a mounted weapon but was removed by the player's gun. The core also uses these "unseen" weapons when all parts have been destroyed. The firing pattern is three wide arcs of shots, and then three multi-directional bursts. A stronger generator increases the speed and spread of the arc.

Game modes

 * 180 seconds - The normal, time-limited mode.
 * Three Ships - No time limit. The player begins with three lives, and gains an extra life for every hundred pieces blasted off a boss.
 * Five Minute attack - The player has a time limit of five minutes to get as far as possible.
 * Sudden Death - The player has one life and no time limit.

How to Unlock Specific Transformations

 * Asura - Choose one side of the Pure Heart and destroy both corners on that side. Continue to attack the core until it explodes. Continue with this pattern on subsequent levels, being careful not to destroy anything on the other two corners. Over the next several levels the Pure Heart will evolve into Double Wider and eventually Wing Arms. Once this evolution is reached, defeat the boss any way you choose and it will eventually evolve into Asura.
 * ISE-ONE - Start by destroying one whole corner on the Pure Heart. Then, destroy the corner diametrically opposite to the one already demolished. Continue destroying the other two corners in any way, it doesn't matter which ones, but get them both. Now, as the stages progress, continue with the same destruction pattern (the initial choice of corner does not matter, as long as the pattern is adhered to). Alternatively, there is another way to unlock the ISE-ONE that most players will find easier. Simply attack the Pure Heart by firing directly downward on the top left and right corners (in any order) to destroy them, then destroy the core without destroying either bottom corner. After a few rounds of this, the boss will evolve into the Armor. Once this has happened, attack the bottom left and right corners from their respective sides of the screen, firing sideways, then finish the boss by destroying the core again, without destroying either top corner. After a few rounds of this, the Double Armor will appear. The boss will evolve from Pure Heart to Double Armor, to Tornado Defender, and finally to the ISE-ONE. Once the ISE-ONE has evolved, it can be destroyed in any way and it will remain an ISE-ONE, with variations. If the same destruction pattern (as the first method to unlock it) is adhered to, it will evolve variants such as Death, Crazy, Excite, and so on. Once the boss has evolved into Double Armor form or beyond, the player can blast off parts on any corner.
 * Hekatoncheir
 * Muramasa - Start off by aiming your directional cannon before the Pure Heart even appears on screen, your goal is to destroy the top two corners by shooting straight down. Accuracy counts here, it has to be the VERY top (I.E. the 'flat part'), if your aim is off, you'll get Wider or Armor for the back. If this doesn't work, you can try this strategy: Aim for the lower right corner to take out the top right corner hitting as close to the 'inside' as possible, repeart on the left side, then destroy the core. Keep this up until you get the Attacker evolution, destroying only the back corners then the core. Once that's done it gets a bit easier as you'll have more room to work in the front. Proceed to destroy the front two corners shooting straight up, making sure to try and hit the flat part whilst leaving the back corners alone and then going for the core. You should get the Double Attacker. Once you get that far, you're sure to get Muramasa.
 * Phoenix - All you have to do is stand in front of the pure heart and shoot only at front corners. In a few rounds repeat shooting the frontal corners and soon it will transform to an Attacker. As you advance in the game (by shooting only the front) the front side of the ship will grow and you wont able to stay in the middle anymore, as this point move to one of the corners of the screen and shoot the ship diagonally by killing the frontal parts first and then the rest. Eventually it will transform to Phoenix
 * Berserker
 * Scorpion - The only hard part of this is getting the Attacker top evolution, but after that it is quite simple. Using the method to get the Attacker top evolution as outlined in the Muramasa guide above, all you need to do is attack the lower corners from the side. It shouldn't be a problem getting it to evolve into Attack Wider. After this, fight it how you wish and it will eventually become the Scorpion.
 * Big Magnum - What a pain this is... Use the strategy for getting the Attacker evolution for the top on the Muramasa guide. When the top evolves into Attacker, aim towards a lower corner. From an elevated position above the lower corners, destroy the lower corner. (I.E. If you are aiming at the lower right corner of the screen, you need to take out the left corner.) Continue this on the other side, repeat this process until you get the Attack Armor. Fight however you wish until it evolves into the Big Magnum.
 * Hammer Head

Tactics

 * Tactic for getting to high level - start by shooting one lower-corner of the pure heart from the sides, do it precisly without hitting any other parts, particularly the top corners, and in level 4-5 the bottom half will evolve into wider, from this part, continue fighting as usual and avoid hitting the top half at any cost! From here it'll stay on wider modifications until you destroy some of top half, avoid IT, and you'll get far...