Once most of the board is filled, the game shifts. Close it out cleanly.
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Sweep dominates. With most symbols placed, many lines already have all 3 of one kind. Sweep fills the rest instantly. This is your fastest tool now.
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Bookends and Sandwich reappear. As gaps shrink, these patterns show up frequently in what’s left.
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Chase cascades aggressively. Every cell you place in the endgame is likely to complete a row or column. Follow each placement immediately to its intersecting line.