It's really any button registered to "O" or "X" on the PICO-8 controller for P1, which includes Z, X, C, and V. No need to give options where there aren't important ones, though. :)
A member registered Apr 10, 2016 · View creator page →
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A racing game for two players, ages 8+, in about ~20 minutes.
A tarot mod for Swords Without Master.
A trick-taking game with hidden partnerships.