1. Cheats:

Pause the game by pressing [P] and [Backspace]. Then choose your option from
the list below:

lamer              Level skip
gunhed             Rapid fire and ammo
bouf               Full health and toggle invincibility
sable              Toggles high speed and jumping
cstrike            Toggles airboard (Turns you into a bird in birdland)
doom               Enemies speed up and take more hits
ken                Quits to DOS
hooker             ensures trip to bonus level    
mark               Kills Jazz
hocus              Teleports Jazz
check              Displays info on status bar
arjan              Displays a message
greetz             Displays another message
tim                Displays yet another message

2. Tip:

     To get to the secret level on level one drop down the hole to the
right  of the halfway checkpoint in Diamondus level two. Take the path
to  the  left of the extra speed sign. Use the trampoline to bounce up
hold left and crash impressively into the wall. Enter the yellow strip
highlighting  the  mouth  and  you'll  find  a  dinky little room with
another  signpost showing a question mark This is your gateway to that
secret level.

3. Action Replay codes:

RTM1342123F     Unlimited health
RTM13421618     Health (use with above)
RTM129E9EFF     Unlimited time
RTM1344B0FF     Time (use with above)
RTM13421463     99 lives
RTM1344AA63     Lives (use with above)
RTM12724699     Unlimited missiles
RTM13428464     Missiles (use with above)
RTM12742664     Unlimited toasters
RTM13428464     Toasters (use with above)
RTM12724664     Unlimited launchers
RTM13428864     Launchers (use with above)