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In the game of Quantum Soccer, the aim is to shape the wave function of a quantum-mechanical “ball” so that the probability of it being inside one of the goals rises above a set threshold. This is achieved by using the motion of the players to alter the energy spectrum of the wave function: when a player moves across the field, the energy that this action provides (or absorbs) enables transitions between certain modes of the wave function. The pairs of modes involved depend on the player’s velocity; the exact rules are spelt out in the mathematical details , but it’s easy to experiment using trial and error.