During gameplay type these codes then press ENTER:
GMGODM Invulnerability
GMPETE All powerups
GMKILL Enemies are easier to kill
GMBIGH You get a big head
GMBORG You become a cyborg
GMNORM Turns you back to normal
GMPERF ???
GMMOVE ???
GMBALL ???

Level Codes:
1 DBDBBABA
2 ADDCAADC
3 ACBABBCC
4 ADDDCACC
5 DDBDBBCA
6 CCDBCCDA
7 AADBDDAC
8 CADDCBCC
9 ADAABADB
10 BADDBBBC
11 ABBDADDA
12 DCADCAAC