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CHEATS
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Press START to pause game play and enter this codes:

Level skip        Hold R and press B, B, B, X,
                  Release R,
                  Hold L and press Y, Y,
                  Release L,
                  Hold and press R, B, B.

Upgrade sword     Hold L + R and press X, B, X, Y, Y, B, X, B

Big head mode     Hold R and press Y, Y, Y, Y,
                  Release R,
                  Hold L and press Y, Y,
                  Hold L + R and press Y, X, Y.