Type the code YOYOYO at the order form.

Now you can use:

ITIHFO : fight 3 rounds instead of just one
ERHNE : fight all the characters instead of one
AOFREOIO : Opens all bonus doors
OFOVH : 2X in bonus rooms
ERHYHRLY : Makes the Toadman Weaker (like you need this one)
OAOAEIOA : Autofly Mode in lab
EATEE : Morphing disabled (Now lets see the 'puter beat ya)
OIVNNFOF : Tadpoles attacking in lab enabled
EHRTRR : Autofly In bonus rooms enabled