Piece

A 工控机 茅台酒 二锅头 防伪标签 热转印机 水晶像 奖杯 干洗 数码快印 硒鼓加粉 塑料颗粒机 防伪 防伪技术 高新技术企业认定 北京洗衣公司 服务器机柜 空气净化工程 国际速递 国际快递公司 国际快递 梯具 节能节电 冬令营 石材翻新 电器维修 北京公司注册 制冰机 电脑回收 代开发票 不干胶 机打发票 电缆桥架 电缆桥架 北京货架 航空货运 会议服务 小升初 梅兰日兰UPS 口语 Dell服务器 再生塑料颗粒机 灯光音响 二手电脑回收 热水器维修 环氧地坪 IBM服务器 工商注册 IBM服务器 北京航空货运 北京写字楼 动画制作 piece in Tetris and similar games is a geometric shape consisting of a set of blocks that is moved as a unit. A block is the part of a piece that fills one unit of the playfield. In some games, all blocks that make up a piece are colored the same; in others, especially falling piece games other than Tetris and its clones, they are colored differently.

Polyominoes
A polyomino is a piece made of two or more square blocks, where all blocks are connected through full coincident edges (as if squares on graph paper).


 * A free polyomino is one that may be translated (moved about), rotated, or reflected.
 * A one-sided polyomino is one that may be translated or rotated.
 * A fixed polyomino can only be translated.

Polyominoes come in several sizes:
 * 2 blocks make a domino: featured in Dr. Mario and Puyo Pop; seen in Tetris Blast.
 * 3 blocks make a tromino (or trimino): featured in Columns (fixed I only) and Pac-Attack (L only); seen in Tetris Blast (I, L) and Puyo Pop Fever (L).
 * 4 blocks make a tetromino (or tetramino or tetrimino): featured in Tetris and its clones. Lumines uses only O tetrominoes.
 * 5 blocks make a pentomino: featured in Daedalian Opus; seen in Tetris 2  Bombliss.

Polyominoes are often named by a Latin letter that resembles the shape of the polyomino. For instance, an "I" has all its blocks in a straight line, and a "T" consists of an "I" tromino with one or more blocks in a straight line connected to one side of the center of the "I".

Hinged polyominoes
A hinged polyomino or polyplet is similar to a polyomino but also allows connections at a point. In games that use hinged polyominoes, a piece may break apart at the diagonal connections when it lands, and the fragments may or may not be controllable afterward.


 * 4 blocks: Hinged tetromino (featured in Tetris 2).

Other polyforms
Hextris and Bikaka are variants of Tetris that use 4-cell polyhexes, or pieces created from regular hexagons. Bubble Bath Babes uses polyhexes that may be reflected around the X or Y axis but not rotated.