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Tetr.io logo.png
Tetr.io logo
Platform(s)Web (Native)
January 31, 2020
March 22, 2020
Latest release0.2.1 / February 8, 2020
Gameplay info
Next pieces5 (default)
Playfield size10 × 20
Hold pieceYes
Hard dropYes
Rotation systemSRS
TETR.IO title.jpg
TETR.IO ingame.jpg

Tetr.io an online multiplayer and single player game developed by osk.


Tetr.io offers multiplayer and solo play. There are currently three single player modes and one multiplayer mode.


In multiplayer, the player can play matches against other players. A player choose to play in the game's Quick Play room where players can play a match with default settings. The Custom Play option allows for creation of custom rooms, with the ability to change settings for the room such as spin bonuses, player limit, the amount of next pieces shown, and others. The player can view public rooms in the Room Listing menu. Each multiplayer game with 3 or more players plays similarly to Tetris 99 along with the targeting options included. A margin time system is also in the game, in which the amount of garbage sent is increased after every once in a while.


The game also includes solo modes, two of which have leaderboards: 40 Lines and Blitz.

40 Lines

In 40 Lines, the objective is to clear 40 lines as fast as possible.


Blitz plays identically to Ultra, with the exception of a level system present similar to Marathon with a variable line goal before increasing the level.


The player can create their own solo mode with most of the settings carried over from the Custom Play room creation menu.


Tetr.io entered the Infdev stage on January 31, 2020, when access to the game was opened for testers on a per request basis.[1] During the Infdev release, players required to represent their IP address to osk via Discord DMs in order to test this version. A month and a half later, the game enter the public Alpha stage on March 22, 2020. This time, all players are free to create/log in to their accounts and play the game. [2]


  1. "TETR.IO is now in INFDEV!". osk blog. January 31, 2020. Archived from the original on February 8, 2020. Retrieved February 8, 2020.
  2. "TETR.IO PUBLIC ALPHA RELEASED!". March 22, 2020. Retrieved .

External links