Fractured 2048 Super
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How to play
Swipe (or use arrow keys / WASD). One swipe moves every board at once — tiles slide and merge 2048-style, but never cross the thick walls.
The Sudoku rule: two equal tiles at or above the constraint threshold (64 by default on 4×4 boards, 32 on 3×3) in the same macro row or column — sitting in different boards — are 
pinned. Pinned tiles can't slide — but they can still merge with a neighbouring equal tile, which resolves the conflict. Tap a pinned tile to see its twin.
Twins inside the same board never pin — they're your merge fuel. Tiles below the threshold never pin either. The constraint only bites across walls.
Escape valve: a pinned tile can still be merged into by a matching tile from its own board — doubling it dissolves the conflict. Or use pins on purpose to anchor your best tile in a corner.
Fractures: a board that fills up with no legal merge turns to stone — grey and inert, but its tiles still pin others. Three stone boards end the run (change this in the Rules lab). Dissolve the pin that chokes a stone board and it revives.
Limited lifelines: you get 10 undos per game, and 2 revives from a game-over. The strongest powers (Move, Fuse, Walless) cost 10 more swipes of cooldown each time you reuse them.
Spawning is announced in advance. Gold-ringed boards are armed to spawn, and the glowing ghost cell inside shows exactly where the tile will be born. On your swipe, an armed board that moved gets its tile on the ghost; an armed board that didn't move gets nothing. Cover a ghost with a tile and that spawn relocates. (How many boards get armed is the Spawn density setting — half by default.) Reach the target on one board: 2048 on 4×4 boards, 512 on 3×3.