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Dreamcast - Maken X cheats

Full pause screen
Press X + Y, while paused the gameplay.


Untested cheats:

Invincibility
Pause game and quickly press 
Down, Left, Up, Right, L, A, X, Left, R, B, Y, Up, L, A, Down.

All Weapons
Pause game and quickly press 
Up, Right, Left, Down, B, L, R, A, Right, X, B, Left, R, Y, Up.