About Merge Cosmos
Merge stardust into moons, stars, black holes and galaxies. A relaxing idle merge game with 36 cosmic wonders to discover.
Tap the Forge to create stardust, then drag identical objects together to merge them into the next tier, from pebbles and moons to pulsars, quasars and whole galaxies. Every object produces Energy, even while you are away, which you spend on upgrades. Reach a Blue Giant to go Supernova for Stellar Shards that power a permanent skill tree.
How to play
The Forge fills the sockets on your board with new objects over time, and every tap on it pushes it along faster. When two identical objects are on the board, drag one onto the other to merge them into the next tier: Stardust becomes a Pebble, then an Asteroid, and so on up to the Genesis Spark, tier 36. Every object makes Energy, which you spend in Upgrades. There is no way to lose, and your cosmos keeps earning while you are away.
On a computer, click the Forge or press Space, and drag an object onto its twin or double-click to send it there. Esc or P pauses. On a phone, tap the Forge, drag to merge, or double-tap an object to send it to its twin.
Computer
- ClickTap the Forge / buy / select
- DragDrag an object onto its twin to merge
- Double-clickSend an object to its twin
- SpaceTap the Forge
- EscorPPause menu
Phone or tablet
- TapTap the Forge / buy / select
- DragDrag an object onto its twin to merge
- Double-tapSend an object to its twin
Tips and tricks
- Tap the Forge quickly to fill the combo ring. When it is full, Overdrive starts: for a few seconds the Forge works three times faster and taps count double.
- If the board fills up, drag old low-tier objects into the Forge to recycle them for Energy.
- A comet flies past now and then. Tap it before it leaves for a free bonus.
- The Gravity Well upgrade merges matching pairs for you on its own, which saves a lot of dragging.
- Before you go Supernova, open the Supernova panel. It shows how many extra Stellar Shards you would get by making the next tier first.
What makes it fun
Merge Cosmos is a calm game for short visits. Each new tier adds a picture and a short line of text to your Codex, so there is always a next discovery to chase. Going Supernova resets your board but gives Stellar Shards for skills such as Twin Forge, so each new cosmos grows faster than the last.
Achievements
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Questions about Merge Cosmos
When can I go Supernova?
Once you make a Blue Giant, tier 17. Your board, Energy and upgrades reset (except Deep Orbit), but your shards, skills, Codex, missions and achievements stay.
What do Stellar Shards do?
Every shard you have ever earned adds 10% to all Energy, even after you spend it on skills in the Supernova tree.
How long does it earn while I am away?
Up to 2 hours at half speed at first. Each Deep Orbit level adds an hour, and the Deep Sleep skill raises it to full speed.
Does my progress save?
Yes. Your board, upgrades, shards, skills and Codex are saved.
- Made by
- Bhayson Games
- Category
- Strategy
- Works on
- Phone, tablet and computer
- Status
- Added September 28, 2026