Controls
- Lightgun: Use the lightgun to move the gunsight of Garcia (or Cliff if you're player 2) around the screen. Squeeze the trigger to fire your character's machine gun, and press the button on the side to make your character launch a missile, which will injure (or kill) all enemies currently on the screen.
- 1 or 2 Player Buttons: Push these buttons to begin the game as player 1 or player 2.
Characters
Garcia and Cliff
These Neo Arc police officers are, still, the protagonists of the game; this time they are on a mission to defeat the army of "Vanguard" who are attacking the city. They must progress along a predefined path through each of the game's four acts and possess the power to shoot anything on the screen including the background objects and innocent bystanders - but just like how they will lose energy, if they should get shot by any of the enemies, they will also lose energy if they accidentally shoot a bystander (that is also indicated by the bystanders collapsing and shouting "Ouch!" or something similar). When they are low on energy, the text "WARNING" will appear over their life bar, and a warning sound effect will start to be heard from the C140; however, they will regain energy (and gain additional missiles, as they only start out with four) at the end of all except the final act, depending on how accurate their shooting was. They now also have a new Police Chief to answer to (the old one was white, but the new one is black) - and a new but unnamed female operative who appears in the end of the game's second to sixth acts.
Innocent Bystanders
There are eight different types of Innocent Bystanders to watch out for; whenever one runs into view, the text of "DON'T SHOOT!" will appear above them. If you accidentally shoot one, you will lose some of your energy as if you had been hit by an enemy (again, it will also be indicated by them collapsing and shouting "Ouch!" or something similar) - and this means that if you accidentally shoot one of them while you are low on energy, it could end up costing you the game. However, they are all smaller than the enemies, so should be easy to avoid.
Zaku
These Transformer-like robots attack by either: running (or leaping) into view from the left or right sides of the screen, coming up directly in front of you, dropping down into view from the top of the screen, or jumping out from behind background objects while firing shots (or throwing grenades) at you.
Atmospheric Airships
These power-driven aircraft attack by: flying into view from the left or right sides of the screen, directly towards you, or from behind you, while firing missiles at you; two of them will also appear at the beginning of the game after the building explodes and all eight Neo Arc police officers run away.
Domu
These Transformer-like robots attack by either: coming up from behind the background objects or running into view from the left or right sides of the screen while firing missiles at you; again, they will take more hits to defeat than the Zaku, and will sometimes cause a huge explosion upon death.
Airship Zaku
These aircraft-carried Transformer-like robots attack by: flying into view from the left or right sides of the screen, directly towards you, or from behind you while firing shots or throwing grenades at you; like the Biker Zaku, they take more hits to kill than the normal Zaku, and will fall to the ground.
Tarantulas
These Transformer-like robots (which do not resemble their namesakes), attack by either: running into view from the left or right sides of the screen, or by coming up directly in front of you, while firing shots at you; they are the first new Transformer-like robot you will encounter in this game.
Mosquitoes
These large, green, insect-like airborne robots attack by either flying into view from the left or right sides of the screen, or dropping down into view from the top of the screen, while firing missiles at you; they also look somewhat more like their namesakes than those of the original did.
Mountains of Needles
These large natural elevations of three very fine slender pieces of polished metal will attack by extending as Garcia and Cliff approach them.
Aggai
This enormous, red, airborne robot (who has been rebuilt since the original defeat) is the boss of the first act; he will first fly into view from the right side of the screen (and off the left), and when the screen starts scrolling to the left he will start firing missiles at you (the text "SHOOT" will also appear above him at this point). Once you have fired enough shots at him to defeat him, he will explode and fall to the ground for the second time - and the "act clear" theme will then be heard from the Yamaha YM-2151, as the text "YOU DEFEATED THE INVASION FORCE. BUT THE TOWN WAS BADLY DAMAGED." appears at the bottom of the screen. (It is also worth noting that for the original Steel Gunner, he was the boss for the second act).
Kurage
These one-eyed jellyfish-like robots attack by running into view from the left or right sides of the screen or dropping down to the ground from the top of it while firing shots at you; once the screen has stopped scrolling downward for the second time in the second act, you will be faced with thirty-two red dots. Once the text "NIGHT VISION MODE ON-LINE." appears at the top of the screen, the "dots" will be revealed to be their aforementioned eyes - and the screen will then start scrolling inwards, as they come running towards you. Once you've killed them all, "NORMAL VISION ACTIVE." will appear.
Boater Zaku
These boat-riding Transformer-like robots will attack by hovering into view from the left and right sides of the screen, while firing shots at you.
Beam Guns
These cannons (of which there is now only one type), will attack by emerging from the left and right sides of the screen, while firing shots at you.
Ceiling Guns
These cannons (which are another new enemy to defeat) attack by coming down into view from the top of the screen while firing shots at you.
Capsules
These small cases (which contain some type of strange-looking brown aliens) will not attack you, and simply stand in place waiting to be shot.
Clone Aliens
These asexually-produced extraterrestrials (who are also contained in small cases) will not attack you and simply stand in place waiting to be shot.
Dummies
When you meet up with Vanguard and Great Leader Danbain for a second time in the game's fourth act, they will transform into two of these green ships as the text "IT'S A DECOY! WE'VE BEEN TRICKED!" appears at the bottom of the screen; they will then begin flying around in front of you.
Other enemies
ICBM Launch Pad
Shutter
Ball-Shaped Shutter- File:SNS Wing.gif Wing
Great Leader Danbain
