Tetr.io

    Players compete against friends and other players in an online stacking game.

    osk

    Playing together

    Online co-op
    1 source
    Online versus
    1 source
    Online multiplayer
    1 source
    Players online
    1 source
    Local co-op
    1 source
    Plays in browser
    1 source
    Not known yet
    Players in online co-op, Best with, How co-op works, Crossplay, Multiplayer through mods, One copy is enough, Free to play, Demo, Playtest, Early access

    Hover, focus or tap a fact to see where it came from.

    How you talk

    Public matchmaking
    1 source
    Not known yet
    Plays without voice or typing, Wordless tools, Friendly with strangers

    About the game

    Tetr.io is a modern yet familiar online stacker developed by osk. Play against friends and foes all over the world, or claim a spot on the leaderboards - the stacker future is yours!
    From IGDB

    Screenshots

    Why we rate it this way

    • The description does not explain specific game mechanics.
    IGDB, checked 1 Nov 2026Tetr.io is a modern yet familiar online stacker developed by osk. Play against friends and foes all over the world, or claim a spot on the leaderboards - the stacker future is yours!

    Sources

    First listed 1 Nov 2026. Updated 6 Nov 2026.