Effect Code Continue Game (Stages 2-3) At the ''Game Over'' screen, rapidly press: Up, Right, Down, Left, A, B Continue Game (Stages 4-6) At the ''Game Over'' screen press Up, Down, Left, Right, B, A, A Continue Game (Stages 7-9) At the ''Game Over'' screen, press A, A, B, B, Down, Up, Right, Left (on controller 2)
When playing the stage that you are inside the helicopter, there is a way to make the door close as soon as it opens. After it opens, just pause the game and leave it paused for about 10 or so seconds, and then unpause the game. After unpausing the game, the door should close, saving you the hassle of worrying about getting sucked out, and you can just concentrate on the enemies.
Contributed By: Saikyo Mog.
Choose the ''2 Player'' game where you are able to knock out the other player (mode B is the one that introduces friendly fire). Once the first screen of foes is defeated, knock out the other player. Each time you defeat the other player, you get a 1UP.
If you are playing with two players, you can also use this to your advantage. When both players are low on health, kill each other because finishing off the other player gives you an extra life. Both players will break even on lives but how have full health. If one player has only one life remaining, that player should kill the other player first.
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