Tetromino: Difference between revisions

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The spelling "tetromino" is standard among mathematicians.
The spelling "tetromino" is standard among mathematicians.
[[The Tetris Company]] had preferred '''tetramino''' around 1999 and has used '''tetrimino''' since 2001.
New games licensed by [[The Tetris Company]] call them '''Tetriminos''' since 2001, and they were previously called '''tetraminoes''' around 1999.


== The basic tetrominoes ==
== The basic tetrominoes ==
Line 11: Line 11:


===''I''===
===''I''===
Other names include ''straight'', ''stick'', and ''long''. This is the only tetromino that can [[Line clear#Tetris|clear four lines]] outside of [[cascade]] games.
Light blue; shaped like a capital I; four Minos in a straight line. Other names include ''straight'', ''stick'', and ''long''. This is the only tetromino that can [[Line clear#Tetris|clear four lines]] outside of [[cascade]] games.
<playfield>
<playfield>
..........
..........
Line 19: Line 19:


===''O''===
===''O''===
Other names include ''square'' and ''block''.
Yellow; a square shape; four Minos in a 2×2 square. Other names include ''square'' and ''block''.
<playfield>
<playfield>
....OO....
....OO....
Line 27: Line 27:


===''T''===
===''T''===
Purple; shaped like a capital T; a row of three Minos with one added above the center.
<playfield>
<playfield>
....T.....
....T.....
Line 34: Line 35:


===''S''===
===''S''===
Green; shaped like a capital S; two stacked horizontal diminos with the top one offset to the right.
Other names include ''inverse skew'' and ''right snake''.
Other names include ''inverse skew'' and ''right snake''.
<playfield>
<playfield>
Line 42: Line 44:


===''Z''===
===''Z''===
Other names include ''skew'' and ''left snake''.
Red; shaped like a capital Z; two stacked horizontal diminos with the top one offset to the left. Other names include ''skew'' and ''left snake''.
<playfield>
<playfield>
...ZZ.....
...ZZ.....
Line 50: Line 52:


===''J''===
===''J''===
Other names include ''gamma'', ''inverse L'', or ''left gun''.
Blue; shaped like a capital J; a row of three Minos with one added above the left side. Other names include ''gamma'', ''inverse L'', or ''left gun''.
<playfield>
<playfield>
...J......
...J......
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===''L''===
===''L''===
Other names include ''right gun''.
Orange; shaped like a capital L; a row of three Minos with one added above the right side. Other names include ''right gun''.
<playfield>
<playfield>
.....L....
.....L....
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In ''[[The Next Tetris]]'', Sticky mode of ''[[Tetris Worlds]]'' and ''[[Tetris Mania]]'', and ''[[Jewelry Master]]'', some tetrominoes are ''multiminoes,'' that is, the tetromino itself is divided into visible components.
In ''[[The Next Tetris]]'', Sticky mode of ''[[Tetris Worlds]]'' and ''[[Tetris Mania]]'', and ''[[Jewelry Master]]'', some tetrominoes are ''multiminoes,'' that is, the tetromino itself is divided into visible components.
Though the tetromino is moved and [[rotate]]d as a unit, once it [[Drop|locks]], the components separate by colors and fall.
Though the tetromino is moved and [[rotate]]d as a unit, once it [[Drop|locks]], the components separate by colors and fall.
== Orientation ==
An orientation of each tetromino, with regards to ''Tetris'' refers to the different ways that tetromino can exist after [[rotate|rotations]].
Normally all the tetrominoes have a total of nineteen orientations, but probably to make things more symmetric, [[Tetris Guideline|newer games]] add six orientations: two for ''S'', ''Z'', and ''I''.
Orientations can be described either by the way they point (especially for T, which at least one reviewer has compared to a finger gesture[http://www.arkmay.com/tetris/pieces.html]) or by the way the longest flat side faces.
{|
! Point up<br>Flat down
! Point right<br>Flat left
! Point down<br>Flat up
! Point left<br>Flat right
|- valign="top"
|<playfield>
..........
....OO....
....OO....
..........
</playfield>
|<playfield>
..........
....OO....
....OO....
..........
</playfield>
|<playfield>
..........
....OO....
....OO....
..........
</playfield>
|<playfield>
..........
....OO....
....OO....
..........
</playfield>
|}
{|
|- valign="top"
|<playfield>
..........
...IIII...
..........
..........
</playfield>
|<playfield>
.....I....
.....I....
.....I....
.....I....
</playfield>
|<playfield>
..........
..........
...IIII...
..........
</playfield>
|<playfield>
....I.....
....I.....
....I.....
....I.....
</playfield>
|}
{|
|- valign="top"
|<playfield>
....T.....
...TTT....
..........
..........
</playfield>
|<playfield>
....T.....
....TT....
....T.....
..........
</playfield>
|<playfield>
..........
...TTT....
....T.....
..........
</playfield>
|<playfield>
....T.....
...TT.....
....T.....
..........
</playfield>
|}
{|
|- valign="top"
|<playfield>
....SS....
...SS.....
..........
..........
</playfield>
|<playfield>
....S.....
....SS....
.....S....
..........
</playfield>
|<playfield>
..........
....SS....
...SS.....
..........
</playfield>
|<playfield>
...S......
...SS.....
....S.....
..........
</playfield>
|}
{|
|- valign="top"
|<playfield>
...ZZ.....
....ZZ....
..........
..........
</playfield>
|<playfield>
.....Z....
....ZZ....
....Z.....
..........
</playfield>
|<playfield>
..........
...ZZ.....
....ZZ....
..........
</playfield>
|<playfield>
....Z.....
...ZZ.....
...Z......
..........
</playfield>
|}
{|
|- valign="top"
|<playfield>
...J......
...JJJ....
..........
..........
</playfield>
|<playfield>
....JJ....
....J.....
....J.....
..........
</playfield>
|<playfield>
..........
...JJJ....
.....J....
..........
</playfield>
|<playfield>
....J.....
....J.....
...JJ.....
..........
</playfield>
|}
{|
|- valign="top"
|<playfield>
.....L....
...LLL....
..........
..........
</playfield>
|<playfield>
....L.....
....L.....
....LL....
..........
</playfield>
|<playfield>
..........
...LLL....
...L......
..........
</playfield>
|<playfield>
...LL.....
....L.....
....L.....
..........
</playfield>
|}


==See also==
==See also==
*[[Piece]]
*[[Piece]]
*[[Orientation]]


==External links==
==External links==

Latest revision as of 16:16, 27 January 2020

A tetromino is a polyomino made of four square blocks. The seven one-sided tetrominoes are I, O, T, S, Z, J, and L.

The spelling "tetromino" is standard among mathematicians. New games licensed by The Tetris Company call them Tetriminos since 2001, and they were previously called tetraminoes around 1999.

The basic tetrominoes

Each tetromino has a letter name and several alternative names.

In most games other than Tetris for NES, Tetris & Dr. Mario, or black-and-white systems, each tetromino has a different color. However, before about 2001, these colors varied from product to product, making it difficult for people who play different games to discuss "the blue piece". Since then, the color schemes associated with SRS and TGM Rotation have dominated new games, and "the blue piece" is always J.

I

Light blue; shaped like a capital I; four Minos in a straight line. Other names include straight, stick, and long. This is the only tetromino that can clear four lines outside of cascade games.

..........
...IIII...


O

Yellow; a square shape; four Minos in a 2×2 square. Other names include square and block.

....OO....
....OO....


T

Purple; shaped like a capital T; a row of three Minos with one added above the center.

....T.....
...TTT....


S

Green; shaped like a capital S; two stacked horizontal diminos with the top one offset to the right. Other names include inverse skew and right snake.

....SS....
...SS.....


Z

Red; shaped like a capital Z; two stacked horizontal diminos with the top one offset to the left. Other names include skew and left snake.

...ZZ.....
....ZZ....


J

Blue; shaped like a capital J; a row of three Minos with one added above the left side. Other names include gamma, inverse L, or left gun.

...J......
...JJJ....


L

Orange; shaped like a capital L; a row of three Minos with one added above the right side. Other names include right gun.

.....L....
...LLL....


Multimino

In The Next Tetris, Sticky mode of Tetris Worlds and Tetris Mania, and Jewelry Master, some tetrominoes are multiminoes, that is, the tetromino itself is divided into visible components. Though the tetromino is moved and rotated as a unit, once it locks, the components separate by colors and fall.

Orientation

An orientation of each tetromino, with regards to Tetris refers to the different ways that tetromino can exist after rotations.

Normally all the tetrominoes have a total of nineteen orientations, but probably to make things more symmetric, newer games add six orientations: two for S, Z, and I.

Orientations can be described either by the way they point (especially for T, which at least one reviewer has compared to a finger gesture[1]) or by the way the longest flat side faces.

Point up
Flat down 		Point right
Flat left 		Point down
Flat up 		Point left
Flat right
..........
....OO....
....OO....
..........
..........
....OO....
....OO....
..........
..........
....OO....
....OO....
..........
..........
....OO....
....OO....
..........
..........
...IIII...
..........
..........
.....I....
.....I....
.....I....
.....I....
..........
..........
...IIII...
..........
....I.....
....I.....
....I.....
....I.....
....T.....
...TTT....
..........
..........
....T.....
....TT....
....T.....
..........
..........
...TTT....
....T.....
..........
....T.....
...TT.....
....T.....
..........
....SS....
...SS.....
..........
..........
....S.....
....SS....
.....S....
..........
..........
....SS....
...SS.....
..........
...S......
...SS.....
....S.....
..........
...ZZ.....
....ZZ....
..........
..........
.....Z....
....ZZ....
....Z.....
..........
..........
...ZZ.....
....ZZ....
..........
....Z.....
...ZZ.....
...Z......
..........
...J......
...JJJ....
..........
..........
....JJ....
....J.....
....J.....
..........
..........
...JJJ....
.....J....
..........
....J.....
....J.....
...JJ.....
..........
.....L....
...LLL....
..........
..........
....L.....
....L.....
....LL....
..........
..........
...LLL....
...L......
..........
...LL.....
....L.....
....L.....
..........

See also

External links

Retrieved from "https://tetris.wiki/index.php?title=Tetromino&oldid=20885"