Perfect Weapon Cheat Codes
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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