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Earthworm Jim
Level Skip:
At any point, pause the game and press A, B, X, A, (A+X), (B+X), (B+X), and (A+X), then unpause to skip to the next level.
Extra Continues:
At any point, pause the game and press A, B, A, B, X, Y, X, and Y.
Extra Ammunition:
At any point, pause the game and press A, B, (B+LT), B, X, A, X, and X.
Extra Life:
At any point, pause the game and press B, B, X, (X+Y), A, A, A, and A.
Extra Plasma Shots:
At any point, pause the game and press A, A, (B+LT), A, A, X, (B+LT), and X.
Hidden Options Screen:
At any point, pause the game and press (L+A), B, X, A, A, B, X, A, and START.
Equinox
Infinite Life:
At the title screen, press LTx2, RTx2, LTx3, RTx3, LTx2, RTx2, LT, and RT.
Extra Innings
Hidden Screens/Menu:
At the "Mode Select" screen, press and hold (LT+RT), then press START and Y (or B). You will get a different screen depending on which option you have highlighted while entering the code.
Earthworm Jim