Hard Drop Tetris Wiki:Glossary

The following are brief definitions of terms related to Tetris and similar games.

Diagram Legend
The following is a legend detailing the functions of the various blocks used in the diagrams throughout the wiki articles.

#

 * 0G
 * Gravity speed of 0 cells per frame where tetrominoes do not automatically drop when spawn. See G.


 * 20G
 * Gravity speed of 20 cells per frame where tetrominoes instantly spawn on top of the stack. See G.

A

 * Active piece
 * Alternate term for falling piece.


 * Add
 * Alternate term for multiplayer garbage sent coined by Tetrinet players.


 * All Clear
 * When the player clears the whole playfield without leaving any blocks behind. Also known as a Bravo or Perfect Clear.


 * ARE
 * A term for entry delay originating from Japan.


 * Arika Rotation System (ARS)
 * The rotation system used by most games published by Arika.

B

 * Back-to-Back
 * Any combination of two or more line clears consisting of either a tetris or a T-Spin without any other line clear between them.


 * Bag
 * A class of randomizer in which a collection of pieces is shuffled, and all are dealt into the preview. (See Random Generator.)


 * Base (T-Spin)
 * The portion of a T-Spin setup, not directly under an overhang, where the T rests upon.


 * Block
 * A solid element occupying one cell of the playfield. Also used as a synonym for "cell" to represent a length or width (e.g. a 2-block-tall hole). Multiple blocks make a piece such as a tetromino. In some publications, a "block" may refer to a whole piece, but Tetriswiki uses "piece" or "tetromino" for clarity.


 * Block Out
 * To top out when a block overlaps the entry position.


 * Bounding box
 * A conceptual mechanism for explaining rotation systems that allows depicting how orientations are positioned relative to one another.


 * Bravo
 * When the player clears the whole playfield without leaving any blocks behind. Also known as a All Clear or Perfect Clear.

C

 * Ceiling
 * The horizontal line separating the in-bounds rows of the playfield from the out-of-bounds rows. Most games place the ceiling at the top of row 20. In most games, the ceiling coincides with the top of the visible portion of the playfield.


 * Cell
 * A unit square within the playfield.


 * Channel (tetrising)
 * The hole to place a vertical I tetromino for a tetris.


 * Column
 * The group of vertical cells inside the playfield, numbered from left to right.


 * Combo
 * 1) The act of clearing lines with consecutive tetrominoes, common to many recent Guideline games.
 * 2) The act of clearing lines in quick succession under a timer-based counter, as seen in Cultris.
 * 3) The act of clearing consecutive non-single line clears, as seen in the TGM series.

D

 * DAS
 * Delayed Auto Shift. Refers to the autorepeat of sideways movement.


 * DAS Delay
 * The initial delay before DAS occurs.


 * Delay
 * Refers to any or all of the following: entry delay, delayed auto shift (DAS), DAS delay, line clear delay, and lock delay.


 * Double
 * The act of clearing two lines with one tetromino.


 * Downstack
 * The act of clearing existing blocks inside the playfield to lower the height of the stack. Most commonly used in multiplayer Tetris to refer to clearing garbage sent by an opponent.


 * Drop
 * Downward movement of a piece.

E

 * Entry delay
 * Time between when one piece finishes and when the following piece enters.


 * EZ T-Spin
 * A T-Spin Single that uses a Wall kick.

F

 * Falling piece
 * The tetromino or other piece under the player's control.


 * Fast drop
 * Another name for soft drop.


 * Firm drop
 * Manual downward motion of a tetromino where the piece lands within a frame and begins the lock delay.


 * Floor kick
 * Upward movement of a piece when it rotates against the floor of the playfield or other blocks.


 * Frame
 * Period during which the sequence of rotation, movement, and gravity is executed, and the result is displayed. Video games in Japan and North America run at 60 frames per second.


 * Funnel
 * A tetris column with a 2-3 cell wide opening at the top for skimming.

G

 * G
 * A unit of speed of one cell per frame. Refers most often to gravity; can also refer to DAS or soft drop speed. For example, when gravity is 20G, each piece falls so quickly that it instantly spawns on top of the playfield.


 * Gap (tetrising)
 * The open column to place a vertical I tetromino for a tetris.


 * Garbage
 * Rows of blocks added to the bottom of the playfield at the start of the game or during the game.


 * Ghost piece
 * A marker in the playfield showing where the falling piece will land. Also known as Temporary Landing System (TLS).


 * Gravity
 * The automatic downward movement of a piece over time.


 * Guideline
 * The specification for how Tetris games made in roughly 2001 and later should operate.

H

 * Hard drop
 * Manual downward motion of a tetromino where the piece lands and locks instantly within a frame.


 * Hold
 * Placing the falling piece in storage and moving the piece that was in storage (or next in line if no piece was in storage) to the top of the playfield.


 * Hole
 * 1) Hollow but enclosed cell(s) inside the stack.
 * 2) The open column to place a vertical I tetromino for a tetris.

I

 * Initial Hold System (IHS)
 * A rule allowing the player to hold the next piece during entry delay.


 * Initial Rotation System (IRS)
 * A rule allowing the player to rotate a piece as it enters the playfield by pressing and holding a button during entry delay.


 * Infinity
 * A rule in which lock delay resets every time a piece is shifted or rotated.

J

 * Jiznickery
 * A misdrop due to an inadvertent zangi-move. It happens in games with firm drop when the player drops a piece but does not wait long enough for the piece to lock before trying to charge DAS or input IRS for the next piece. The New Tetris was especially susceptible due to its lack of manual locking.

K

 * Kick
 * A term that refers to a wall kick and/or a floor kick.

L

 * Landing (tetromino)
 * When the active tetromino makes contact with the surface of the stack or the bottom of the playfield.


 * Line
 * Common term to refer to a row in the playfield.


 * Line clear
 * Creation of a complete row of blocks with no holes after a piece locks. It disappears, and the blocks above the row move down.


 * Lock
 * After a piece has landed on the floor of the playfield or on other blocks, it becomes part of the playfield and is no longer subject to the player's control. Or to cancel lock delay, causing a piece to lock immediately.


 * Lock delay
 * The time between when a piece lands and when it locks.


 * Lockdown
 * See Lock.


 * Lock Out
 * To top out by locking a piece above the ceiling.

M

 * Matrix
 * A term used by The Tetris Company for a playfield.


 * Mino
 * 1) A term used by The Tetris Company for a block; this sense is little used outside TTC.
 * 2) The "block creatures" in the games Tetris Worlds and Kids Tetris are also called Minos.
 * 3) In Japanese Sega Tetris/TGM parlance, the term is used as an abbreviation of "Tetramino", thus referring to the whole piece instead of a single cell. The term "block", however, is used more often.


 * Misaim
 * Alternate term for misdrop.


 * Misdrop
 * A misdrop is when a player accidentally drops a tetromino in the wrong place, or in the wrong orientation.


 * Move reset
 * Another name for Infinity.

N

 * Next piece
 * Alternate term for piece preview.


 * Notch (T-Spin)
 * The crevice in a T-Spin setup that is directly under an overhang.

O

 * Open column
 * The hole to place a vertical I tetromino for a tetris.


 * Orientation
 * The direction that a piece faces. The number of orientations in Tetris pieces may not always be equal to the number of geometric orientations a shape can take. Shapes like Z, S, and I which only has two orientations, or O, which has only one, can be treated as having four internal representations in some games, most commonly those that implement the Super Rotation System.


 * Overhang
 * A block or column of blocks extending from a wall of blocks over an empty cell or column. Overhangs are commonly used as a method of reordering piece placements when a player recieves undesirable tetromino sequences. In games where T-Spins are rewarded, overhangs may be used to set up a T-Spin.

P

 * Piece
 * A set of blocks that moves as a unit.


 * Piece preview
 * A display area of the tetrion devoted to displaying the next pieces that will enter the playfield.


 * Perfect Clear
 * When the player clears the whole playfield without leaving any blocks behind. Also known as a All Clear or Bravo.


 * Playfield
 * A grid of cells into which pieces are placed.

R

 * Random Generator
 * A specific randomizer used in newer games that guarantees an even distribution of piece types. It consists of a bag with one of each of the seven tetrominoes.


 * Randomizer
 * An algorithm that generates a sequence of piece types.


 * Rectum
 * At least four adjacent rows that are filled with blocks except for a single hole in the same column.


 * Rotate
 * To change a piece's orientation by turning it clockwise or counterclockwise, generally by 90 degrees.


 * Rotating the tires
 * Alternate term for a twist.


 * Rotation system
 * A rule specifying the orientation for each piece type and the movements (including wall kicks and floor kicks) when changing orientations.


 * Row
 * The group of horizontal cells inside the playfield, numbered from bottom to top.

S

 * Shadow
 * Alternate term for ghost piece.


 * Shift
 * Moving a piece sideways.


 * Single
 * The act of clearing one line with one tetromino.


 * Skimming
 * Line clearing the edge or surface of a stack to purposely downstack, flatten the field, or upstack for a tetris.


 * Slide
 * Placing a piece under an overhang by moving it sideways.


 * Soft drop
 * Moving the piece down faster than gravity, while still retaining control over it.


 * Sonic drop
 * A name for firm drop arising from the TGM community.


 * Sonic lock
 * A name for hard drop arising from the TGM community.


 * Spawn location
 * Where the active tetromino enters the playfield.


 * Spawn orientation
 * The initial orientation of the active tetromino upon appearing in the playfield.


 * Speed
 * 1) The rate at which the active tetromino automatically falls. See Gravity.
 * 2) The rate at which a player drops a tetromino. See Tetromino Per Time.
 * 3) The specific delay values that determine how fast a game can be played optimally, or how slow it can be played for survival.


 * Super Rotation System (SRS)
 * A rotation system for tetrominoes used by games that adhere to the Tetris Guideline.


 * Stack
 * 1) The structure created from placing tetrominoes inside the playfield.
 * 2) The act of placing tetrominoes inside the playfield.


 * Step reset
 * Lock delay resets every time the falling piece moves downward.

T

 * Temporary Landing System (TLS)
 * Arika's name for the ghost piece.


 * Tetlag
 * Effect of failure to adapt to different variations of a puzzle game, especially different rotation systems. (Coined by colour_thief as a portmanteau of "tetromino" and "jet lag".)


 * Tetrad
 * Alternate term for tetromino used in Nintendo Power reviews of 8-bit Tetris games.


 * Tetramino
 * Alternate term for tetromino allegedly used by The Tetris Company in the late 1990s.


 * Tetrimino
 * Alternate term for tetromino used by The Tetris Company as of Tetris Worlds.


 * Tetrion
 * A term used by The Tetris Company for the game object that contains a playfield. Different tetrions may implement different variations of the game rules. (Not to be confused with treknobabble.)


 * Tetris
 * 1) The Tetris Company's trademark for products implementing the Soviet Mind Game.
 * 2) The act of clearing four lines with one tetromino.
 * 1) The act of clearing four lines with one tetromino.


 * Tetromino
 * A piece consisting of four square blocks joined at the sides.


 * Top out
 * A piece reaches the top of the playfield and the game ends.


 * Triple
 * The act of clearing three lines with one tetromino.


 * T-Spin
 * A twist performed with the T tetromino that satisfies specific requirements.


 * T-Spin Single
 * A T-Spin that clears one line.


 * T-Spin Double
 * A T-Spin that clears two lines.


 * T-Spin Triple
 * A T-Spin that clears three lines.


 * Twist
 * Placing a piece under an overhang by rotating it.

U

 * Upstack
 * The act of placing tetrominoes inside the playfield to increase the height of the stack.

W

 * Wall kick
 * Sideways movement of a piece when it rotates against the floor of the playfield or other blocks.


 * Well
 * A term used in some older games for the playfield.

Z

 * Zangi-move
 * Moving a piece downward, sliding it, and locking it.