Max Steel - Platform: Dreamcast

Cheat mode: 
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At the title screen, hold Start and press 
Y, A, B(2), Y, A, X, B, X, B to enable cheat mode. 
Press X to display the level select screen. 
The following codes may now also be entered:

Level skip:
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While playing a game, hold L + Start + Y. 

Invincibility:
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While playing a game, hold L + Start + X. 

All inventory, weapons, health, ammunition:
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While playing a game, hold L + Start + A.