Finish the game in “Hard” Mode to get access to an even harder “Expert” Mode. In this you get stunned by every enemy, not only electric shockers and such.
Adventure of Chalvo:
Easy:
World 1, Level 7: DBX
World 2, Level 1: KBC
World 2, Level 7: R5X
World 3, Level 1: P5C
World 3, Level 7: ZBG
World 4, Level 1: GBK
World 4, Level 7: N5G
Final Boss: Q5K
Normal:
World 1, Level 7: BDX
World 2, Level 1: CDC
World 2, Level 7: HZX
World 3, Level 1: AZC
World 3, Level 7: 5DG
World 4, Level 1: QDK
World 4, Level 7: 6ZG
Final Boss: 3ZK
Hard:
World 1, Level 7: DF3
World 2, Level 1: KF8
World 2, Level 7: R13
World 3, Level 1: P18
World 3, Level 7: ZFQ
World 4, Level 1: GFP
World 4, Level 7: N1Q
Final Boss: Q1P
Expert:
World 1, Level 1: B76
World 1, Level 7: C7H
World 2, Level 1: HT6
World 2, Level 7: 8TH
World 3, Level 1: 57N
World 3, Level 7: X7R
World 4, Level 1: 6TN
World 4, Level 7: 3TR
Final Boss: BJ9
Pocket and Cushion:
Stages 1-16 Clear: HQFJF
Stages 1-20 Clear: 7JSJ0
Score Attack:
Stages 1-16 Clear: XPJCZ
Stages 1-20 Clear: XDJHZ
CT: Unlimited Lives
CC: 0-0005F34-FFFF
CT: Many Points
CC: 0-0004B56-FFFF
CC: 0-0004B57-007F
CT: Many Points (Score Attack)
CC: 0-0005F1E-FFFF