Pengo 2
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Level Codes:
Level 0: POSTCARD   Level 5: RIVERGOD
Level 1: U2U2U2U2   Level 6: GAUSSIAN
Level 2: SILENCIO   Level 7: BJORK4U2
Level 3: NEURONET   Level 8: BULLROAR
Level 4: REPLOMAN   Level 9: XENOCIDE

Cheats:
Enter "CHEETAAH" as password. During the game, press HELP key to skip
to the next level. (A confirmation message appears when cheat is active.)

Enter "ULTIMATE" as password to see the ending sequence.