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In the context of Tetris, fan games are computer tetromino games unconnected with Elorg, The Tetris Company, or any other licensor of rights in the Tetris trademark. They tend to follow the well-known rules of Tetris but may not strictly follow any official guidelines.
Straight tetromino games
The following games more or less faithfully replicate the rules of some version of Tetris, either pre-Guideline or post-Guideline:
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- 4-Tris - Homebrew game cartridge by Joe Zbiciak for the Mattel Intellivision game console
- 7*Ris - TGM fan game for the 3DS game SmileBASIC
- ACiD Tetris (later renamed Super ACiD Block Attack)
- Aint - free software for MS-DOS, possibly the first copylefted tetromino game
- EGAint - successor to Aint
- Alizarin Tetris - features colour gravity similar to The Next Tetris.
- Alleytris - 4-wide well
- Atomic Tetris - clone for MS-DOS, focusing on versus play with items
- Brian Caos Tempting Music Player (versions Beta 1 and Beta 2 previously known as 'Brian Caos Tetris Music Player'), IT/MOD/S3M/XM music player with a built-in Tetris game
- Bedter by Andrew Bednarz - freeware for Windows and Linux, famously targeted by TTC which alleged 'look and feel' copyright violation
- BiTRIS - clone focusing on doubles play
- Blockbox - A web based Java TGM clone
- Blocks A Java version of the game.
- Block Star - Integrated Facebook Tetris, featuring comparison leaderboard to your circle of friends, or all users. Subsequently taken over by The Tetris Company.
- Blockdrop - A browser game with several modes.
- Blocktrix - A derivative of TetriNET.
- BombStepper - A game featuring Tetris Battle-style bombs.
- Brash Point II - A Flash Point clone for PC-88
- Breakris by Jürgen Müller - freeware for Windows. It has a very good single and multiplayer-Tetris, plus Breakris - Breakout and Tetris at the same time.
- Crowley: World Tour - Tetris clone for the ZX Spectrum Next
- Cultris - A game focusing on combo-based play.
- Cultris II - Sequel to Cultris.
- dcQuad - Homebrew for Dreamcast.
- Double Blocks - A clone for DOS. Features multiplayer via modem.
- Dúshlán - Homebrew game for NES. A port of Falling Blocks with extra features.
- Eitrix - Successor to Varmint's EITtris. Has 8-player play.
- Emlith - A clone for Windows 3.x. Later ported to 32-bit Windows.
- Ezoris - Clone for x68000.
- Falling Blocks - Game for ZX Spectrum. Stage-based.
- Falling Down - Features many gimmicks and the ability to add user-created courses.
- Falling Up - a 'twist' on Tetris (freeware/open source for Windows, OS X, linux)
- Face to Face (決戰俄羅斯) - a 1990 Taiwanese Tetris/Bloxeed clone focusing on versus play, apparently popular in China, Taiwan and Hong Kong.
- Freefall - An implementation in the Inform language designed for text adventures.
- Full HD Tetris - A series of games with Full HD resolution and large playfields.
- Geo - A game for 8-bit Atari.
- GinT - Falling Tetromino game within the 3D world of Second Life.
- GTET - A clone of Tetris The Grand Master.
- Heboris - A clone inspired by the TGM series. Has many unofficial expansions.
- Java Tetris v2.11 - Nice Java applet Tetris clone by Andreas Ludwig that supports multi-player and computer AI players
- Jstris - An online clone with multiplayer.
- King of Stackers - Turn based strategy tetris
- Klotz - Game for Windows 2.x.
- Kralizec Tetris - Tetris game for the MSX
- LJ65 (formerly Tetramino) - a homebrew game for NES.
- Lockjaw - primarily a guideline simulator, with dozens of options to change behavior
- Lockjaw: The Overdose (formerly Tetanus On Drugs) - free software for Game Boy Advance, inspired by Tetripz
- MaTris - A game written using pygame. Has been used in academia.
- MegaTris (DOS, Roman Macionczyk) - Polish clone.
- Modular Tetris - Tetris clone with highly customizable playing grid as well as pentominoes
- N-Blox - Tetris clone by Neave Games. Later acquired by The Tetris Company.
- Neitris - A multiplayer clone inspired by EITtris.
- netris (Trevor Slocum) - A game playable over SSH.
- Nishisansou Tetris - Tetris clone for the Sharp X68000.
- NullpoMino - highly customisable clone with many modes.
- Nyet - one of the earliest Tetris clones, dating from 1988.
- Pokittris - Tetris for the Pokitto 
- Q2Tetris - Mod for Quake 2.
- Quadrapassel (formerly Gnometris)
- Quinn - Described as an arcade-style tetromino puzzle game written and designed specifically for Mac OS X
- Rheolism - A Tetris game in one line of BBC Basic.
- Rotris - Homebrew for GBA, inspired by Pufftris
- Startris - A game on king.com where you can win real money
- Sirtet Voyager - A game for Mac OS.
- Small Tetris - A game with a 2 KiB executable.
- Super Puzzler - A game for 8-bit Atari.
- Super Retriss - A game with the goal of clearing a target 'flicking' block.
- Syoboris - A SDL-based game for Mac probably inspired by Heboris, now apparently lost.
- T3tr0s - A Tetris game that has 10 themes based on various Tetris games that can be changed on the fly.
- Team Tetris - A clone based on the Atari arcade version for Commodore 64.
- Tet42 - A clone based on the Atari arcade version for DOS.
- Tetracycline - Homebrew for the Sega Master System.
- Tetriculis — Tetris as Google Gadget.
- Tetripz by Mute Fantasies - freeware for MS-DOS, with visual distortions of the playfield
- Tetris (Flash, Gavin Ward) - A game inspired by TGM.
- Tetris 2 (Fuxoft) - Game for ZX Spectrum.
- Tetris Deluxe (Todd S. Lehman) - A game inspired by Atari's arcade version of Tetris.
- Tetris Lite - Game for Windows 9x. Uses an AI for its demo mode.
- Tetris Pro (Craig Rothwell) - A DOS game inspired by the Amiga game.
- ТЕТРИС SEMIPRO-68k - clone for the X68000, notable for the first use of 20G
- Tetris to the Max - Clone for DOS. 38 wide playfield.
- Tetris Unlimited (Yuri Balagurov) - Clone for DOS. Has many performance statistics and customisation options.
- Tetris V - a Sega Tetris clone for the X68000.
- Tetris Weightlifting - A modified version of Tetris using exercise equipment as the control mechanism.
- Tetr.js - A guideline compliant web based client with 40L and Dig modes
- Texmaster - possibly the most accurate PC-based simulator of the TGM series
- Textris (rsninja) - A recreation of the Electronika 60 version, but with modern Guideline rules.
- Textris DS - A homebrew game for the Nintendo DS.
- T-Game 4 - homebrew for the MSX.
- Tommy's Nyet - shareware clone for DOS. Has a hot-seat 'tournament mode' where multiple players are given the same piece sequence and need to get as high a score as possible.
- Touhou Battle Gaiden - A Tetris Battle Gaiden-style game with Touhou Project characters.
- Twintris (Digital Marketing, programmed by Svein Berge) - A clone for Amiga
- UNO Free Fall, 2007
- Varmint's EITtris - A multiplayer clone with powerups.
- Vertris - A simple cross-platform clone.
- Vitetris - A terminal-based clone.
- WinTris - Clone for Windows 3.x. Includes extended pieces.
- Yet Another Tetris - Clone for Windows 3.x. Had a piece editor and adjustable playfield size.
- Yetris - A terminal-based clone.
- Zentris - by Robert J. Sundling
- ZTetris - Game for Texas Instruments graphing calculators.
1-key finesse games
Tetris Effect For Mac
These are games that assign a key to each combination of rotation and horizontal movement, which in a 10-column playfield would require 40 keys.
- Keyboard Falling Blocks - One key finesse 40L game
These are games that incorporate adult elements.
Malicious piece generation
Variants that attempt to give the player the worst possible piece.
- Bastet - Literally, Bastard Tetris. Made to be as annoying and frustrating as possible.
- Birdris - DOS game by Andrew Bird.
- Hatetris - Variation by Sam Hughes of Things of Interest. Has a replay system.
- Stacked Odds - Uses an 8-wide playfield.
- Tetrevil - Incorporates a system to balance piece distribution (choose between weights, 7-bag and 21-bag).
- Worst Piece Piece Game - Hold is available. Has six levels of difficulty.
In addition, the following games previously listed have game modes that attempt to do this:
- Abandoned Bricks in Bastet mode (using the algorithm from v0.41 of Bastet)
- Cultris II during the WTF challenge
- F-Tetris in Bastard! mode
- Java Duel Tetris in Nightmare mode
- LTris with Expert Mode on (with the constraint that piece generation still acts as a bag randomiser in this mode)
- NullpoMino when using the Tetrevil mode mod (also part of Blitz's mod pack)
- Zeromeaner when using the Eviline randomiser (successor to Tetrevil)
Other piece sets
These games have similar gameplay to Tetris but change the piece set, most commonly by adding pentominoes, but also other larger or smaller polyominoes, or pseudo-polyominoes, or sometimes even quasi-polyominoes.
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- Combinos - Successor to ntris.
- FÜNEF - Game for Windows 2.x. Uses pentominoes.
- Heptrix - Uses a selection of heptominoes.
- Infinitris - Game with many options, including input recording.
- nlith - A game for PC-9801, possibly the first Japanese Tetris derivative game.
- ntris - A game that gives larger pieces as the player progresses.
- N-Tris (Diamond Games) - A Flash game with a similar idea.
- Pentis - DOS game. Uses pentominoes. Has customisable keys.
- Pentis (Tony Raugas) - ZX Spectrum game.
- Pentix - DOS game. Adds pentominoes as well as smaller polyominoes. Possibly the first ever Tetris derivative game.
- Pentix (Andrei Gorianov) - Remake of the DOS Pentix. Includes touch input.
- Pentix++ - Online pentomino game. Has leaderboards.
- Pentrix (Cathelius) - Has cascade gravity.
- PROTO (PROgressive Tetris Outline) - Game for Windows 9x. Uses pentominoes.
- Rammer - Playfield is rotated 90 degrees for landscape play. Has large pieces.
- TERIAS WIN - A game that uses pseudo-trominoes.
- The Son of Tetris Project - adds pieces to the piece set starting from level 3.
- Tototris - Apparently lost.
Tetris For Mac
In addition, the following games previously listed have the option to play with a non-standard piece set:
- Super Retriss
- Tetris Deluxe (Todd S. Lehman)
- Yet Another Tetris
These games correspond to attempts to take the gameplay of Tetris into higher (or lower) dimensions. See also List of games#Other_.22-tris.22_games.
- Humorous versions#1D Tetris - Various 1D variants.
- 3D Tetris (online game) - 3dtetris.com 3D variant of the classic Tetris game. You can play the game: online, offline and mobile. The game use the Java virtual machine.
- 3DTRIS - 3dtris.de A clone of Blockout (3D variant of Tetris) in Macromedia Flash. Its gameplay is very smooth, just like original Blockout. Online high score list with growing competitions.
- 3Tris - A Blockout clone.
- 4D-Tris - A 4D variant where the aim is to fill 2 × 2 × 2 layers.
- Blockout II - blockout.net The best clone of Blockout (3D Tetris) for Windows using DirectX. Online high score list, forum, wiki.
- Frac - A 3D variant for DOS and Macintosh.
- Frac4d - A 4D variant derived from Frac. Released as freeware in 2006.
- HyperTetris - Another 4D variant with a 4 × 4 × 4 × 10 playfield.
- oti3 - A Blockout-like 3D variant.
- Polytope Tetris - A variant with a configurable number of dimensions (though playability suffers at 5D and above).
- Takalith - A Blockout-like game for the PC-9801.
- Wakataka - A clone of Takalith for Windows 3.1.
- Takalith EX - A Takalith-inspired game for Windows 9x.
These games have game play rules inspired by Tetris, such as rotation of shapes to form complete lines, but introduce rule variations that change the game play greatly.
See also Humorous versions for games too short or not playable enough to have their own page.
- BEATris - A combination of rhythm game and Tetris.
- Bomblin - A Bombliss clone, taking inspiration from the TGM series.
- Bombrite - Another Bombliss-type game.
- Bomb'n Blast - A homebrew game for ColecoVision.
- Da - merges Tetris gameplay and Columns gameplay
- Dream of Pixels - A game where the player has to remove tetromino-shaped pieces from a cloud mass.
- Equadrix - Form expressions matching the target number.
- First-Person Tetris - the player's viewpoint is centred on the falling piece, and rotates when the piece is rotated.
- Go Tetris! - Merges Tetris gameplay with the capturing rules of Go.
- Java Tetris - A Java Tetris game that follows the gameplay rules of the original, but has more than 30 shape types and a few new game modes, including a 'Hardcore' mode where the game is played on a 125x125 grid.
- Heaven - Based on the xkcd strip of the same name; regularly drops 'heavenly' blocks that cover the entire stack.
- Hell Tetris - Based on another xkcd strip; gives the playfield a rounded bottom.
- Hexlis - A Flash game where the rows are expressed as hexadecimal numbers.
- Tetris16 - A terminal game with the same idea.
- Kowaris - Introduces a mechanic where blocks can break.
- Kuzuris - Online game inspired by Kowaris. Apparently defunct.
- Monotris - Flash game. Drop pieces to form tetrominoes.
- Not Tetris - Incorporates a physics engine. The aim is to stack as many pieces as possible on the playfield before topping out.
- Not Tetris 2 - Adds a game mode where lines can be cleared.
- Phystris - Incorporates a physics engine. Has modes based on clearing horizonal lines, clearing colour lines, and making groups of blocks of the same colour.
- Puzzle Juggle Trouble - two pieces fall simultaneously, clear lines or 5x5 squares
- Remtris - Freeware clone with cascade gravity.
- Remtris 2 - Sequel to Remtris, focusing on multiplayer.
- Retris - Has a gimmick on every alternate piece.
- Quadra - Open source clone with cascade gravity, successor to Remtris 2. Features very fast-paced online play.
- Quatris (DOS, Eugene Kim) and its sequels
- Structris - Game for Apple II. Dodge falling tetrominoes that are fired at the player.
- Tetrex - A game that uses tetrahexes.
- [[Tetris<45]] - A game where pieces fall at a 45-degree angle.
- Tetris'D: The Game - Dodge falling tetrominoes.
- Tetrisweeper - Combines Tetris and Minesweeper. Apparently lost.
- Tetron - A game on a cylinder.
- Textris - A Wordtris-type game.
- Texttris - A Wordtris-type game.
- Torus - Another game on a cylinder.
- Tuper Tario Tros. - Combines Super Mario Bros. and Tetris.
- Untris - A Tetris game played in reverse.
Pieces made out of non-rectangular shapes
These games have similar gameplay to Tetris but use pieces made out of other polygons such as hexagons.
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Tetris For Mac Catalina
- A-1 Geo-Fit Game Pack - A Windows 9x game. Uses polyabolos.
- BeeTris (Philippe Basciano) - A Windows 9x game. Uses polyhexes, similar to Hex Tetris.
- Beetris (Simsalabim Software) - A DOS game. Uses polyhexes and a hexagonal playfield. Lines are cleared in two directions.
- Bikaka - A Macintosh game. Uses polyhexes.
- Blockz! - A Flash game. The player can select between polyominos, polyhexes and polyiamonds.
- Hex Tetris - A Windows 3.x game. Uses polyhexes.
- Hextris A game for UNIX later ported to Mac and DOS. Uses polyhexes.
- Pyramid - An unlicensed game for NES. Uses polyabolos.
- Pyramid 2 - Sequel. Supports two players.
- TAZ A Windows 3.x game. Uses polyiamonds.
- Triangle Tetris A game for DOS. Uses polyiamonds.
See also Hexion, an arcade game by Konami.
Comparison of notable fan games
Tetris Macos Catalina
Tetris Machine For Sale
- Tetris and Tetris Clones - nearly 200 games covered