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| The action of ''Tetris'' happens within a machine called a [[tetrion]].
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| The largest part of the tetrion consists of the [[playfield]] measuring ten spaces across by twenty spaces down.
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| It has other parts explained below.
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| [[Random Generator|Randomly]] selected [[tetromino]]es, or shapes consisting of four square blocks, fall from the top of the playfield one at a time.
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| Each tetromino enters the playfield with a given [[orientation]] and color depending on its shape.
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| Part of the tetrion, called the [[piece preview]], shows the next pieces that will enter the playfield.
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| The player can [[rotate]] the falling tetromino ninety degrees at a time within the plane of the playfield by pressing the counterclockwise or clockwise rotation buttons, provided the piece has room to rotate.
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| Some versions of the game [[wall kick|nudge]] the tetromino away from the wall or other blocks in order to make room.
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| The player can shift the falling tetromino sideways one space at a time by pressing the left or right arrow or [[DAS|holding it for quicker movement]], provided the piece has room to move. Pieces cannot shift through walls or other blocks.
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| At the top left, or in some cases the bottom right, of the tetrion is an area called the [[hold piece|hold]] box where a player can store a tetromino for later use.
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| At any time while a tetromino falls, the player can move it to the hold box, and any tetromino held earlier now moves to the top of the playfield.
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| After moving a tetromino to the hold box, the player must then lock the resulting tetromino before holding again (see below).
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| Each tetromino [[drop|moves downward]] slowly by itself.
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| Generally a player can use some method to "drop" the tetromino, or make it move downward faster.
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| Once the tetromino lands on the floor or other blocks, the piece will [[lock delay|delay]] shortly before locking in which time the player can move it.
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| After locking, a player can no longer move the tetromino.
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| When a tetromino locks and by doing so fills all empty spaces within one or more rows of the playfield, those full rows will [[line clear|clear.]]
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| Remaining blocks above will move down by as many rows removed.
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| If the playfield has not [[top out|filled up]] with blocks, the next piece enters. If they have piled up so high that the next piece cannot enter, however, the game is over.
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| == See also ==
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| *[[Glossary]]
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| *[[General technique]]
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| [[Category:General Information]]
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