Unlimited lives:
Start game play in two player mode and obtain a high score for both
players. Intentionally have one of the players lose all their lives and enter
ALIEN as a name on the high score screen. The corresponding player will have
unlimited lives when game play continues.
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Level select:
Press Up, Down, 2, Left, Right, 2, Up, Down, 2 when the
"Start" and "Configure" options appear at the title screen
(before the Alien 3 logo disappears).
Unlimited lives:
Start game play in two player mode and obtain a high score for both
players. Intentionally have one of the players lose all their lives and enter
"ALIEN" as a name on the high score screen. The corresponding player
will have unlimited lives when game play continues.
Extra ammunition:
Start a game in two player mode and intentionally die, then switch to
single player mode.
