Type yoyoyo in at order form.
Cheat - codes:
itihfo - fight 3 rounds
erhne - fight all characters
aofreoio - opens all bonus doors
erhyhrly - makes toadman weaker
oaoaeioa - autofly mode in lab
eatee - morphing disabled
oivnnfof - tadpoles attacking in lab enabled.
To get to the secret rooms in each level, change your
weapon by pressing B+B, then do as follows for each room:
Train Station: When you get there, whack the lantern with
your weapon, then a suitcase will open. Go inside.
Sewer: Whack the three sticks of dynamite then stand back.
The cover will open for you to go inside.
Abandoned Factory: Go all the way to the left, then whack
the glass. Go into the opened pipe.
Saw Mill: Use the weapon to press the button on the left.
Then go into the opened hole.
Boiler Room: Use your weapon to whack the mousetrap on
the bottom level. Then go inside the dryer.
Junk Yard: Use the weapon to operate the crane. Then go
directly under the giant magnet.
Toadman's lair: After you kill all the toads, whack the
record player, and the Toadman will leave. The pipe organ
should open up, revealing a secret entrance. You should
follow this path, since this will be your last chance to
get new ammunition or activate the special moves.
For invincibility in bonus rounds type: orufu
For Z-axis movement type: xus_d3
For special move type: hnitoh-12