The following passwords are for either Hard or Easy modes as noted below:

• NB50 - Music Room
• QLXZ(Easy) / ?2FK (Hard) - Stage 10: Temple
• CLZT(Easy) / GWLH (Hard) - Stage 11: Volcano
• J62?(Easy) / C92K (Hard) - Stage 12: Dark Mountain
• 40N6(Easy) / 8NBX (Hard) - Stage 13 Boss + max health & potions
• DP03(Easy) / GPLH (Hard) - Stage 13: North Castle
• &&&&(Easy) / JR6P (Hard) - Stage 14: Floating Castle part 1
• ?2KC(Easy) / 7XGN (Hard) - Stage 1: Ruins
• 40N7(Easy) / K7W6 (Hard) - Stage 1: Ruins + max health & potions
• BN&S(Easy) / KK7B (Hard) - Stage 2: Sky
• BCWR(Easy) / V5?3 (Hard) - Stage 3: Waterfall
• 5JSQ(Easy) / XSRR (Hard) - Stage 4a: Mushroom Cave
• NS6K(Easy) / ZW4& (Hard) - Stage 5: Forest
• 4RD7(Easy) / FWWF (Hard) - Stage 6: Swamp
• 1NWB(Easy) / 3MTT (Hard) - Stage 7: Bubble Cave
• PHC&(Easy) / XBQQ (Hard) - Stage 8: Mountain Base
• VM84(Easy) / D6HL (Hard) - Stage 9: Ice Palace
• BN7Z (Hard) - Stage 15: Floating Castle part 2
• N0QB (Hard) - Stage 16 Boss + max health & potions
• 0ZZ6 (Hard) - Stage 16: Floating Castle part 3
• ?9MW (Hard) - Stage 17: Floating Castle part 4

After the intros, in Stage 1, wait for the boss to transform into a demon and then make sure your final hit is with mouse bombs. You can slip one under his foot if you are careful. This will warp you to level 7.