Reactor Zero

    Players pick classes and defend a core against waves of enemies together.

    Reactor Poland

    Playing together

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

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    How you talk

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

    About the game

    Reactor Zero is a fast-paced multiplayer browser co-op action game where players choose classes and defend a core against waves of enemies.
    From IGDB

    Screenshots

    Sources

    First listed 1 Nov 2026. Updated 3 Nov 2026.