Command attack minigame:
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Beat story mode 2 times.
Tekken Bowling minigame:
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Beat story mode 3 times.
Theater mode:
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Beat story mode 1 time.
Unlock Stage 0 in Dojo Mode:
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Complete all 6 stages in Dojo mode to unlock stage 0. In this mode, you
can play against all downloaded ghost characters whenever you want.