Display Coordinates:
While playing, press ENTER then type "Show".

Double Weapon Damage:
While playing, press ENTER then type "Think Positive'to grant temporary
double damage to the selected hero.

Full Ammo:
While playing, press ENTER then type "My Drug #" where # is the slot number
for one of your weapons.

Invincibility:
While playing, press ENTER then type "Mister White".

Kill All Enemies:
While playing, press ENTER then type "Talking to Me". Whenever you approach
an enemy they will die.

Level Select:
While playing, press ENTER then type "I'll Take You There #" where # is the
desired level.

No Fog:
While playing, press ENTER then type "Glory Day" to remove all fog from the
map.

Restore Health:
While playing, press ENTER then type "Rat Race" to restore the selected
hero's life.

Speed Boost:
While playing, press ENTER then type "What A Difference". The selected hero
will receive a temporary speed boost.

Weapon Speed Boost:
While playing, press ENTER then type "Satisfaction" for a temporary weapon
speed boost.

Thanks to Revolution reader Mercenary 907!