Some stages have special rules, applied from time to time. The higher the stage, the higher the frequency of activation. You can check whether a stage have special rules looking for its icons in the stage summary.
Rain
Whenever this rule is activated, the whole line will fall over the game board, and will be replaced with a new one.
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Flood
Whenever this rule is activated, a complete line of blocks will appear at the bottom of the game board.
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Wind
Whenever this rule is activated, all the blocks in the game board will be pushed in one direction.
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