Skimming
Downward
When a player is starved of I tetrominoes and garbage is coming at a fast rate, he has to depend on other tetrominoes to keep himself from topping out.
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If a player is close to topping out, create a funnel for safety.
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Easy to grasp? How about these?
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Upward
When unable to tetris because of a funnel, fill it up.
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