abstract
| - The player controls a cursor that covers two squares horizontally in the invisible game grid. Blocks within this cursor can be swapped, or a block can be swapped with an empty space. If a block is moved into a gap with no blocks underneath it, the block falls as though affected by gravity. Players cannot directly move blocks vertically or diagonally, though in most game modes, they can raise the entire puzzle more quickly. To clear blocks, the player must align them in rows or columns of three or more identically colored blocks (for example, three red blocks in a contiguous horizontal row). The blocks then disappear from the playfield, and any blocks above them fall into the cleared space. Clearing more than three blocks in a single move scores a "combo", worth extra points. If a clear causes other blocks to fall and cause additional clears, the player scores a "chain", also worth extra points. With skill and planning, the player can cause multiple contiguous clears to occur one after another, scoring a higher chain count and progressively larger bonuses, and above a certain chain count, the game plays a celebratory fanfare when the chain is completed. Clearing blocks also causes the stack to stop rising temporarily, and scoring chains and combos causes the stack to remain stopped for a variable amount of time (determined by the size of the combo or chain).
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