In order to enable these cheats, you'll need to pause the game by pressing the P key, then hit the BACKSPACE key before you type in the code for the cheat you want to enable. Also, in some versions of Jazz Jackrabbit, you have to add the letters DD before each cheat

Code Description
sable Turn Jazz red and get a big speed increase
cstrike Gives you a flying surfboard
bad Gives you the escort bird
doom Makes the enemies tougher
ken Exit to DOS
hooker Collect a gem
mark Kills Jazz
apogee 16 color version that runs at half the speed
lamer Skip the current level
hocus Teleport around the current level
bouf Become invincible
gunhed Get all weapons plus 100 rounds of ammunition for each