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In Super Mario World, the controllable coin plays the P-Switch music when it is active. However, if Yoshi eats the coin while it is still active, the P-Switch music will continue playing indefinitely instead of running out as usual.
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In Level 6-Fortress 1 in Super Mario Bros. 3, if a Star is collected on the specific frame when Mario hits a coin block, Boom Boom (who is encountered in the next room) will die immediately upon seeing Mario, without even needing to be touched.
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