Digimon Rumble Arena 2
Evolve energy item:
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Press Y, Right, Down, B, L, A, R, A, Y at the title screen.
One-hit kills:
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Press Right, Up, Left, Down, A, L + R at the title screen.
Evolve meter always full:
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Press X, Right, A, Y, Left, B, L + R at the title screen