ExponenTorus

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Columns wrap into a cylinder (left/right edges are neighbours); tiles fall from the top. Touch: flick a tile to swap it; two-finger drag to roll the grid. Mouse: click a tile then a neighbour (or drag it) to swap. Keys: arrows/WASD roll the whole grid under a fixed cursor (wrapping both ways, like a torus); Space/Enter to pick up the cursor tile, then a direction to swap; Esc cancels.