While playing, press 'P' to pause the game. Type "NCC-1701"and press 'Return'. Then press 'N' and the screen should flash. Press 'P' again to unpause and from there on, both players should have infinite lives and they can choose any weapon by pressing 'F1' to 'F6'.

After defeating a Goosecopter, fire continuously at one of the tokens. After 32 hits, it will turn into a star, which when collected will yield mega-powerful six-way fire. Just be careful not to hit the token again before collecting it, or it will revert back to the one of the ordinary power-up tokens. Type "NCC-1701" and press 'Return' during game play to get unlimited lives.