Tetris Wiki

Back-to-Back (BtB) or Back-2-Back (B2B) clears are any combination of two or more "difficult" line clears without an "easy" line clear between them. The recent games Tetris Worlds and Tetris DS consider a 4-line clear ("tetris") or a T-spin line clear to be difficult.

Recognition[]

Back-to-Back Recognition in Guideline Games

Clear Type Recognition
Single No
Double No
Triple No
Tetris Yes
T-Spin Single Yes
T-Spin Double Yes
T-Spin Triple Yes


GGGGGGGGG
GGGGGGGGG
GGGGGGGGG
GGGGGGGGG
GGGGGGGGG
GGGGGGGGG
GGGGGGGGG
GGGGGGGGG

BtB bonus

GGGGGGGGG
GGGGGGGGG
GGGGGGGGG
GGGGGGGGG
GGGGGGGGGI
GGGGGGGGGI
GGGGGGGGGI
GGGGGGGGGI

Tetris

J
JJJ
GGGGGGGGG
GGGGGGGGG
GGGGGGGGG
GGGGGGGGG

Place J

J
JJJ
GGGGGGGGGI
GGGGGGGGGI
GGGGGGGGGI
GGGGGGGGGI

BtB Tetris

In the above diagrams, BtB is recognized for the second tetris line clear because the line clear right before was also a tetris. The J tetromino placement did not clear any lines and, therefore, does not break the BtB chain.


GGGGGGGGG
GGGGGGGGG
GGGGGGGGG
GGGGGGGGG
GGGGGGGGG

T-Spin → Tetris

P
PP
PGGGGGGGGG
GGGGGGGGG
GGGGGGGGG
GGGGGGGGG
GGGGGGGGG

EZ TSS

T
TT
GGGGGGGGGI
GGGGGGGGGI
GGGGGGGGGI
GGGGGGGGGI

BtB Tetris

GGGGGGGGG
GGGGGGGGG
GGGGGGGGG
GGGGGGGGG
GGGGGGGGG

Tetris → T-Spin

GGGGGGGGG
GGGGGGGGGI
GGGGGGGGGI
GGGGGGGGGI
GGGGGGGGGI

Tetris

P
PP
GGGGGGGGGP

BtB EZ TSS

All types of "difficult" clears share the same state variable. For example, a player can clear a line with a T-Spin Single using the T tetromino, then clear four lines with an I tetromino, still earning him a Back-to-Back tetris.


GGGGGGG
GGGGGGGGG
GGGGGGGGG
GGGGGGGGG
GGGGGGGGG
GGGGGGGGG
GGGGGGGGG

No BtB bonus

GGGGGGG
GGGGGGGGG
GGGGGGGGG
GGGGGGGGGI
GGGGGGGGGI
GGGGGGGGGI
GGGGGGGGGI

Tetris

GGGGGGGJJJ
GGGGGGGGGJ
GGGGGGGGG

Double

P
PP
GGGGGGGGGP

Non-BtB T-Spin Single

Here, BtB is not recognized for the T-Spin line clear because the double line clear broke the BtB chain.


GGGGGGG
GGGGGGGGG
GGGGGGGGG
GGGGGGGGG
GGGGGGGGG
GGGGGGGGG
GGGGGGGGG

BtB bonus

GGGGGGGJJJ
GGGGGGGGGJ
GGGGGGGGG
GGGGGGGGG
GGGGGGGGG
GGGGGGGGG
GGGGGGGGG

Double

GGGGGGGGG
GGGGGGGGGI
GGGGGGGGGI
GGGGGGGGGI
GGGGGGGGGI

Tetris

P
PP
GGGGGGGGGP

BtB T-Spin Single

The above shows that BtB is recognized for the T-Spin line clear because the line clear right before was a tetris.

Reward[]

In certain Tetris game modes, you can earn extra points or deal an additional line of garbage by clearing Back-to-Back.