B-OS // Games
DOUBLE IT
A number merging arcade puzzle where the numbers are alive: liquid bodies that stretch, bridge and fuse on an orbital ring. Easy to learn, endless to master. Free, in your browser, no install.
How to play
- Aim and release. Your next number waits at the center. Tap a gap on the ring (or drag to slingshot) to place it.
- Matching neighbours merge and double: 2 and 2 become 4, 4 and 4 become 8, onward past 8192 into compact cosmic notation.
- Chains are the real game. A merge that lands beside its own kind merges again. Deep chains score exponentially and charge your power core.
- Operators change the rules. In Classic, equal neighbours wait for a + to ignite them, a − halves any number you tap, and a rare T transposes any number to a new gap.
- Don't fill the ring. When no gap remains, the run ends. Keep it breathing.
Four modes
| Mode | Identity |
|---|---|
| CLASSIC | Where every run starts. Mathematical operators enter the deal: equals need a spark; chains are built, not found. |
| ZEN | Pure merging: no operators, no clock. The meditative core loop, unlocked after your first finished Classic run. |
| TIME ATTACK | Race the clock: every merge buys time, deep chains buy more. Unlocked by completing three challenges. |
| ECLIPSE | The endgame, unlocked once all five powers are yours: a constellation that fuses three stored powers into one of seventeen discoverable Ultimates. |
The powers
Play charges a core; a charged core offers a choice of mathematical constants. φ reorders the ring into golden harmony. π gathers scattered kin. e supercharges your next merge. Σ sweeps every matching pair at once. ∞ stretches the combo window for one combo. In ECLIPSE mode you may store a power instead of using it. Three stored powers fuse into an Ultimate whose identity depends on the recipe. Finding all seventeen is its own quest, and the rarest event in the game collapses the whole board into a single supreme number.
Made to run anywhere
DOUBLE IT renders its liquid with a single WebGL2 shader pass and classifies your device into one of five performance tiers, from entry level phones to flagships, so every player gets the best version their hardware can honestly hold. Curious how? The devlog covers the renderer, the graphics that adapt to each device and the black hole in depth.
FAQ
Is it really free?
Yes. The browser version is free to play, no account, no install. The Android app on Google Play is free too, supported by ads between games; watching an ad to continue a run is always your choice.
Does it work on my phone?
Any modern browser with WebGL2 (Chrome, Safari, Firefox, Edge) on phone, tablet or desktop. On Android, the easiest way is the app on Google Play. You can also add the web version from the browser menu ("Add to Home Screen") and it runs full screen like a native app.
Is my progress saved?
Best scores, unlocks and discoveries are saved locally on your device. Nothing is uploaded and no account exists to lose.
Is there an Android app?
Yes. DOUBLE IT is on Google Play, free. The itch.io page is the best place to follow updates.
Questions or feedback? See the contact channel on the B-OS core, or leave a comment on itch.io.