Tetris Wiki
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Combos are bonuses that exist in certain games which reward multiple line clears in quick succession. The exact conditions for triggering combos, and the amount of importance assigned to them, vary from game to game.

General strategy

By leaving two columns open, one can clear combos easily. However, an I tetromino cannot clear a line in this case, so the Hold box should contain a non I piece, if the game allows, or the bottom of the funnel should be 1 cell wide.

TetTetTetTetTetTetTetTetTetTet
gTetTetTetTetTetTetTetTetTet
ggTetTetTetTetTetgTetTet
gggTetggTetgTetTet
ggggggggTetTet
ggggggggTetTet
ggggggggTetTet
ggggggggTetTet
ggggggggTetTet
ggggggggTetTet
ggggGgggTetTet
gggGGGggTetTet
GGGGGGGGTetTet
GGGGGGGGSTet
GGGGGGGGSS
GGGGGGGGTetS
GGGGGGGGTetTet
GGGGGGGGSTet
GGGGGGGGSS
GGGGGGGGTetS

Combo number 1
(with T in hold)

You can help illustrate this combo by adding a piece.
TetTetTetTetTetTetTetTetTetTet
gTetTetTetTetTetTetTetTetTet
ggTetTetTetTetTetgTetTet
gggTetggTetgTetTet
ggggggggTetTet
ggggggggTetTet
ggggggggTetTet
ggggggggTetTet
ggggggggTetTet
ggggggggTetTet
ggggGgggTetTet
gggGGGggTetTet
GGGGGGGGTetTet
GGGGGGGGTetTet
GGGGGGGGSTet
GGGGGGGGSS
GGGGGGGGGS
GGGGGGGGGTet
GGGGGGGGGTet
GGGGGGGGGTet

Combo number 2
(with slot for I)

You can help illustrate this combo by adding a piece.

Various skimming methods can end up in combos.

Games with combos in their rules

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