Gameplay of Tetris
ultracet online tenuate online soma online phentermine online vicodin online cheap ortho cheap vicodin cheap levitra online adipex free motorola ringtones order adipex free nextel ringtones order ultram nokia ringtones funny ringtones carisoprodol online phentermine online valium online qwest ringtones tenuate online sonyericsson ringtones free motorola ringtones cheap cyclobenzaprine cheap norco cheap lortab flexeril online free tracfone ringtones carisoprodol online paxil free qwest ringtones tramadol online levitra online didrex online punk ringtones ultracet hydrocodone online buy xenical free nokia ringtones free sprint ringtones diethylpropion online online adipex polyphonic ringtones cialis online cheap ultram clomid online free sagem ringtones free nextel ringtones cheap alprazolam ultram online cheap alprazolam free samsung ringtones viagra online motorola ringtones viagra online phentermine online ultram online cheap diazepam cheap rivotril ativan online clonazepam online tramadol online buy carisoprodol cheap meridia valium online cheap zoloft cheap cyclobenzaprine free sonyericsson ringtones order flexeril xanax free nokia ringtones valium online wellbutrin online sildenafil zoloft online valium online midi ringtones cialis online qwest ringtones free real ringtones free real ringtones polyphonic ringtones tracfone ringtones ultracet online norco online free polyphonic ringtones levitra online ambien online cheap sildenafil cheap prozac online xanax cheap ortho funny ringtones vicodin online cheap phentermine cheap norco lortab online cheap hydrocodone cheap ativan buy paxil free mono ringtones valium cheap tramadol cheap zoloft hydrocodone cheap viagra but albuterol rivotril online verizon ringtones lorazepam order viagra didrex online order phentermine cingular ringtones free ericsson ringtones free sony ericsson ringtones motorola ringtones buy zanaflex flexeril online samsung ringtones nokia ringtones cheap diazepam sonyericsson ringtones buy lorazepam free real ringtones cheap rivotril buy ambien albuterol online cialis online ambien online sagem ringtones cheap norco cheap meridia nexium online free mono ringtones hgh online cheap ultram ativan online wellbutrin online free free ringtones order diazepam free sprint ringtones lortab online carisoprodol online verizon ringtones clomid online cheap xenical xanax online free free ringtones cheap wellbutrin buy carisoprodol tracfone ringtones sharp ringtones ativan online buy norco sony ericsson ringtones free tracfone ringtones sonyericsson ringtones soma online meridia online buy zyban online clonazepam free music ringtones cyclobenzaprine online ativan online cheap paxil ativan online nexium mp3 ringtones hgh online propecia online samsung ringtones ortho cheap zyban free punk ringtones lipitor online mtv ringtones vigrx online lorazepam online buy fioricet order lorazepam free cool ringtones qwest ringtones cheap diazepam tenuate online clonazepam online fioricet online cheap ativan buy clonazepam propecia online free mp3 ringtones hydrocodone online carisoprodol online didrex online levitra nextel ringtones cheap zyban free mp3 ringtones levitra buy celexa free tracfone ringtones The action of Tetris happens within a machine called a tetrion.
The largest part of the tetrion consists of the playfield measuring ten spaces across by twenty spaces down. It has other parts explained below.
Randomly selected tetrominoes, or shapes consisting of four square blocks, fall from the top of the playfield one at a time. Each tetromino enters the playfield with a given orientation and color depending on its shape. Part of the tetrion, called the piece preview, shows the next pieces that will enter the playfield.
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. Some versions of the game nudge the tetromino away from the wall or other blocks in order to make room.
The player can shift the falling tetromino sideways one space at a time by pressing the left or right arrow or holding it for quicker movement, provided the piece has room to move. Pieces cannot shift through walls or other blocks.
At the top left, or in some cases the bottom right, of the tetrion is an area called the hold box where a player can store a tetromino for later use. 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. After moving a tetromino to the hold box, the player must then lock the resulting tetromino before holding again (see below).
Each tetromino moves downward slowly by itself. Generally a player can use some method to "drop" the tetromino, or make it move downward faster. Once the tetromino lands on the floor or other blocks, the piece will delay shortly before locking in which time the player can move it. After locking, a player can no longer move the tetromino.
When a tetromino locks and by doing so fills all empty spaces within one or more rows of the playfield, those full rows will clear. Remaining blocks above will move down by as many rows removed.
If the playfield has not filled up with blocks, the next piece enters.