The stack keeps rising, slide your two-wide cursor to swap blocks, line up three of a colour to clear them, and hold the tower below the ceiling.
A wall of coloured blocks creeps upward from the bottom. Move a two-wide cursor over any pair and swap them sideways to arrange matches; three or more of one colour in a line clear and the blocks above drop down. Chains earn meter you can spend to lift a column. Let the stack reach the top and the game ends.
Swaprise revisits Panel de Pon, released by Intelligent Systems for Nintendo in 1995 and rebuilt for the West as Tetris Attack with different characters and no connection to Tetris whatsoever.
The stack rises from below continuously and you swap blocks horizontally in pairs, which sounds gentle until you notice what it allows: because blocks fall after a clear, you can swap a piece into a gap mid-collapse and chain a match that did not exist a moment earlier. Skilled play is almost entirely about setting up those mid-fall swaps.
Swaprise is an original free browser game in the rising-block swap-matching tradition, with solo, CPU, local and online play. Just open and play.