Hold B and press P to access the map, then enter the code:
Effect Code All Weapons and Keys A, Left, A, B, A, Right, A, C, A Extra Screen Sizes Up, Right, L, Up, Right, Right, R, A, Left God Mode Up, Right, A, B, A, Down, A, L, L Invincibility Up, Right, A, B, A, Down, A, LS(2) Item Locations on Map L, R, R, Right, Up, B, B, Left, R Open All Levels L, Up, C, C, R, Down, A, Left, Left Reveal Entire Map L, R, R, A, Left, Left, Up, A, C Walls on Map LS, RS(2), A, Left(2), Up, A, C
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