O2Jam World Online: Find O2World and Play in a Browser
Looking for O2Jam World online? The browser project O2World can be found at o2jam.world, and creator GGC also has an O2World page on itch.io. BeatCombo is a separate browser rhythm game you can try if you want seven-key play with your own music.
What is O2World?
The creator's itch.io page describes an HTML5 seven-key rhythm game playable in a browser. It also discusses multiplayer, community charts and skins as work in progress. That description does not establish which of those features are currently available; check the project itself for its latest playable build.
Browser play is only part of the choice
Both the O2World description and BeatCombo offer a route to keyboard rhythm gameplay without a traditional PC installer. The useful question is what you want to play. For O2World's own experience, start on its site. For a new chart built from your own recording, use BeatCombo's audio editor.
BeatCombo detects musical attacks and tempo, then builds several difficulties. The chart is generated rather than copied from an original O2Jam map. It runs on your device during generation, so trying a personal song does not require publishing it.
Try seven-key play here
- Choose a library song and a difficulty.
- Use S D F Space J K L; Beginner charts use just D F J K.
- Match taps and holds to the judgement line, then use accuracy and combo feedback to track your improvement.
No account is required to play. BeatCombo has its own chart leaderboards; scores, accounts and progress do not carry over from O2World. We do not claim to host its tracks or to replace its community.
Looking for a different O2Jam version?
See the O2Jam Lab guide for the music game lab, the Steam guide for desktop listings, or the old PC client guide if you want to revisit an older setup.
Sources checked November 1, 2026: O2World website and GGC's O2World project description.