Hidden artwork
Place the game disc in a PC compatible CD-ROM drive to find .BMP images and two short voice samples in .WAV format in the "Omake" directory. -From: WOLFPAC35E@aol.com

All weapons
Successfully complete the game in under five hours and save the game. Then, start a new game from the saved game file to receive all weapons including the ray gun, which is not available in any shop or vending-machine. The ray gun fires four heat-seeking lasers.

Homing ray
Successfully complete the game in between five to seven hours and save the game. Then, start a new game from the saved game file to receive the homing ray weapon.

200 Hassy Drinks
Successfully complete the game and the following requirements, and save the game:

Mad mode
Successfully complete the game three times or more, and on the third time or higher through the game, complete the four requirements for the "200 Hassy Drinks" code, and save the game. Then, start a new game from the saved game file. The phrase "Mad Mode" will appear next to the health bar. In this mode, 200 Hassy Drinks, infinite ammunition, all weapons (including the ray gun) will be available and automatically reload and rapid fire.

Swimmer mode
Successfully complete the game three times or more, and on the third time or higher through the game, complete zero to three of the four requirements for the "200 Hassy Drinks" code. Have Eliot drink at least five cups of the "Free Water" that is found in the Shower Operation Room of the Kimra Xenobiological Laboratory, then complete and save the game. In this mode, the characters normal clothes will be replaced by swimsuits and holding B will cause Eliot to swim.

Big eyes mode (North American version)
Successfully complete the game on the "Hard" difficulty setting. In this mode, the characters will have big eyes and a big lip, and the weapon they are carrying will be visible.

Lab card passcode
Obtain the Lab card from Rat's Place, then return to Janean. Eliot will give Janean the Lab card and she will ask for the passcode, enter "0513" as the passcode.

Bank card passcodes
Go to the Bank Of Kimra (across the street from Rat's Place) and enter the passcode for one of the following bank cards to access that account with the corresponding amount of money: