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there is no duel disk in arcade machines.
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The homophone for "duel" is "dual."
In real life you don't need a duel disk to duel.
It is played with a duel runner and a duel board. The duel can be initiated without the consent of the opponent with a field spell Speed World. When a riding duel starts in a stadium the MC will shout 'Riding Duel, Acceleration.'