Mothership level
Successfully complete adventure mode with Mecha Godzilla to unlock the Mothership level.

Gallery photos
Play through the game on hard difficulty setting. While fighting, various buildings that you destroy will have special Atari power-ups inside. Collect these to unlock a gallery picture.

Taunt
To do a taunt, press B + X or A + X.

Special moves
Moves that are special to some monsters can be executed by pressing R + L or A + Y. For example, Gigan teleports and Megalon digs underground. Note: While underground with Megalon you have to continue holding these buttons to move around. Target yourself under your opponent and execute a grab. You will emerge from the ground with the opponent in your hands. If you miss, you will be standing open to attack because you are exhausted from digging.

Cheat mode
At the main menu, highlight "Versus" mode, then hold L + B + R (in that order), then release B, R, L (in that order) to display the cheat entry screen. Enter one of the following codes to activate the corresponding cheat function: