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At the pause menu:
Alternate walking animation:
While playing, press pause then press L1, R1, L1, R1, L1, L1, R1, R1, Square.
Invisible shield:
While playing, press pause then press Up, Up, Down, Down, Left, Right, Left,
Right, Square, Triangle.
Spelunker mode:
Start a new game and enter SPELUNKER as a name. This mode has alternate
dialogue, death with one hit, and the death sound from the original Spelunker.
Alternate walking animation:
While playing, press pause then press L1, R1, L1, R1, L1, L1, R1, R1, Square.
Invisible shield:
While playing, press pause then press Up, Up, Down, Down, Left, Right, Left,
Right, Square, Triangle.
Spelunker mode:
Start a new game and enter SPELUNKER as a name. This mode has alternate
dialogue, death with one hit, and the death sound from the original Spelunker.