Cheat mode
Hold [F10] while entering one of the following cheat codes. Then, hold [F10] and press [F5] to activate the corresponding cheat function as many times as needed. To enter another code, hold [F10] and press [F6] to disable the current code. Then, hold [F10] and enter the next code.

Effect Code

Restore shield [F2] [F1] [F4] [F3]
Red player turns black [F2] [F1] [F4] [F3] [F3] [F4] [F1] [F2]
Reload weapon 0 [F2] [F4] [F1] [F3] [F1] [F3] [F4] [F2]
Reload weapon 1 [F4] [F3] [F1] [F2] [F4] [F3] [F1] [F2]
Reload weapon 2 [F2] [F1] [F2] [F4] [F2] [F1] [F3]

Level Password

2 TAFRGYBIRR
3 CRGRGYBLRY
4 FUMRGYBLRL
5 SIFUGOBLLY
6 TAGUGOBLLL
7 CRMUGOBLLL
8 FEMUGOBYSL

Bonus level
Complete all ten skill levels in a precinct assault mode game to unlock the "Bug Hunt" level.