Lighting the first spark…
No ads in Astro Merge — just you, the well and thirty chapters of Greek myth
Play Astro Merge: The Cosmogony — a free Greek myth drop-and-merge puzzle in your browser
Astro Merge: The Cosmogony is a free browser drop-and-merge puzzle. Two fragments of creation make one rung higher — climb from Spark to Sun across thirty Greek myth chapters, dodge void shards and Nyx’s veil, and free the moon-maiden Artemis from the Well of Night.
Astro Merge: The Cosmogony is a free browser-based drop-and-merge physics puzzle built on Greek creation myth. Erebus, the primordial dark, unstitched the ladder of creation and shook its fragments into the Well of Night — then took the moon-maiden Artemis with him. You are Aster, apprentice of the Titaness Phoebe, and your whole world is one well, one queue of falling fragments, and one sentence of arithmetic: two of a kind become one rung higher.
Eleven rungs separate a Spark from a Cosmos, and you are never handed anything above the fourth, so everything higher has to be built out of what you were given — while the heap grows, void shards bond with nothing, Nyx occasionally hides the drop from you, and a glowing chaos line waits near the rim for the first careless stack.
How to play
- Aim. Move the mouse, or drag your finger across the well, to choose the column the next fragment falls down. A dashed guide and a ghost ring show where it will land — and if the landing will fuse with a matching fragment, the ring turns green and the partner pulses.
- Drop. Click, tap, or simply release the drag.
- Fuse. Two fragments of the same kind that touch become the next rung, released at the point of contact. Fusions within a second of each other chain into a combo worth up to ×5.
- Guard the chaos line. If a settled fragment stays above the glowing line for two seconds, the well gives way. A bar at the top of the well shows how much of that grace you have spent.
- Read the queue. The next fragment is previewed in the ring at the top right. The mistake that ends runs is always made with the fragment you are not holding.
- Seal, or gamble. The moment the chapter goal is met you may seal the chapter and keep it. Staying in costs fragments and risks the line, but it is the only way to reach the three-star par.
Controls
| Input | Action |
|---|---|
| Move the pointer / drag | Aim the next drop |
| Click / tap / release | Drop the fragment |
| ← → or A D | Nudge the aim |
| Space / Enter | Drop |
| U | Titan's Hand — take the last fragment back (three per chapter) |
| E | Oracle's Eye — simulate the shot before you take it (three per chapter) |
| X | Earthshaker — shake the heap flatter (two per chapter) |
| R / Esc | Restart the chapter / pause |
The eleven rungs of creation
| # | Fragment | Greek | What it is |
|---|---|---|---|
| 1 | Spark | Σπινθήρ | the first thing that was ever lit |
| 2 | Stone | Πέτρος | two sparks agreeing to stay in one place |
| 3 | Ember | Ἄνθραξ | heat that has learned to wait |
| 4 | Dew | Δρόσος | water, and therefore memory |
| 5 | Bloom | Ἄνθος | the first thing that wanted to grow |
| 6 | Crystal | Κρύσταλλος | order itself |
| 7 | Comet | Κομήτης | the dark, wounded and beautiful |
| 8 | Star | Ἀστήρ | a promise that the dark has an edge |
| 9 | Moon | Σελήνη | Artemis's own light, and the key to her chains |
| 10 | Sun | Ἥλιος | an argument the dark cannot win |
| 11 | Cosmos | Κόσμος | the finished ladder — collide two and you get the Crown of Ananke |
The rules, exactly
| Situation | What happens |
|---|---|
| Two fragments of the same kind touch | They fuse into one fragment of the next rung at the point of contact |
| Two Cosmos touch | They annihilate into the Crown of Ananke — the largest score in the game |
| A void shard touches anything else | Nothing. It is a physical obstacle and a permanent hole in the board |
| Two void shards touch | They cancel out and vanish — the only way to clear them |
| A fragment settles above the chaos line | A two-second countdown starts; drop the heap back and it resets. Run out and the chapter is lost |
| Fragments run out with the goal unmet | The chapter is lost — but its sequence is fixed, so the second attempt is a plan rather than a lottery |
The four acts of the campaign
| Act | Chapters | What it teaches |
|---|---|---|
| I · The First Spark | 1–8 | Sparks, stones, embers and dew; the habit of never stacking in a column |
| II · The Ladder of Creation | 9–16 | Crystals and comets in a narrower well, and Erebus's void shards |
| III · The Veil of Nyx | 17–24 | Drops you cannot see coming, and the first Star and Moon |
| IV · The Crown of Ananke | 25–30 | A cracked rim, comets as raw material, and a final chapter that asks for the Sun |
Campaign versus the endless well
| Campaign | Endless — the open well | |
|---|---|---|
| Structure | Thirty chapters in four acts, each with its own goal, fragment budget and measured par | One well that never fills, played until the heap crosses the line |
| Difficulty | Ramps from three rungs of fragments to six, with voids and the veil arriving in Acts II and III | Grows with you: the queue gets heavier every thirty fragments and the dark slips in more often |
| Tools | Three undos, three Oracle's Eyes and two Earthshakers per chapter | The same, once per run |
| What you chase | Stars: one for the goal, three for the measured par line | One number, kept on your device |
Why par is a number you can trust
Plenty of puzzle games invent a three-star line. This one measures it. Every chapter ships with a fixed sequence of fragments, and that sequence was handed to the same reference oracle that runs inside the page: it plays the chapter to the end under exactly the rules you face — void shards, chain fusions, the chaos line, the same physics — and the score it actually reached becomes par. That is why chapter one asks for 65 points and the last chapter asks for more than two thousand, and why the Oracle's Eye can tell you the truth: it is not an animation, it is the simulation, run forward on a copy of your well before you commit.
Strategy that actually works
- Keep two flat columns. A well that is flat everywhere can absorb anything; one tall tower plus a Bloom in the queue is a lost run.
- Drop big first. The largest fragment you are given should go down early, while there is room to build around it.
- Bury the void shards. Put them against a wall at the bottom, never in the middle where the ladder needs to grow.
- Chain on purpose. A fusion that lands beside a matching fragment fuses again a moment later, and the combo multiplier is where par comes from.
- Seal when the goal is met. Nothing is lost by leaving early. The book of this game is written by the runs you did not throw away.
Technical notes
The whole game is one self-contained page: no third-party scripts, no trackers, and no network calls after load. Every pixel is drawn in code on an HTML5 canvas — the engraved basin, the eleven sigils, the nebula and the rotating zodiac wheel behind the well — and the layout is recomputed on every resize, so the same well is playable on a 320-pixel phone and on a desktop monitor.
The simulation is a deterministic fixed-timestep circle solver — gravity, positional correction and restitution resolved 120 times a second, with no Math.random() anywhere in the physics. Each chapter's fragment sequence is dealt from its own seed, which is why the same chapter is the same puzzle on every device, why retries are a plan rather than a lottery, and why par could be measured offline and baked into the level data as a number instead of a guess. Progress is stored locally under astromerge.save.v1; nothing is uploaded, because there is no server.
JustPlays Original — handcrafted, ad-free · Browse all free puzzle games →
Astro Merge: The Cosmogony — frequently asked questions
Is Astro Merge: The Cosmogony free to play?
Yes. Astro Merge is completely free, needs no account, no download and no plugin, and it never asks for payment. It runs in any modern browser on desktop, tablet or phone, and your progress is stored only in your own browser.
How do you play Astro Merge?
Move the pointer or your finger to choose where the next fragment should fall, then click, tap or release to drop it. Two fragments of the same kind touch and fuse into the next rung of the ladder: two Sparks make a Stone, two Stones make an Ember, and so on up to the Cosmos. The run ends only if a settled fragment is left above the glowing chaos line for two full seconds.
What happens if the heap crosses the chaos line?
Nothing at first. A fragment has to settle with its top above the glowing line and stay there for two seconds before the well gives way, and the timer resets the moment the heap drops back down. The bar on the screen shows how much of that grace period you have used, so a risky stack is always a visible risk rather than a surprise.
What are void shards and what is Nyx's veil?
Void shards are Erebus's own fragments. From Act II he slips them into your queue, and they fuse with nothing except another void shard, so they are pure obstruction that has to be buried low or paired off. Nyx's veil is a screen effect from Act III: on certain drops the night-goddess hides the guide line and the landing ghost, so you have to read the heap itself before you commit.
How many chapters are there and how hard do they get?
Thirty chapters in four acts. Act I hands you the three smallest fragments and asks for a handful of merges; by Act IV you are given Comets and asked to forge the Moon and finally the Sun, with void shards in the queue and the veil across the well. Every par line was measured before shipping: the reference oracle in the page played each chapter under the same rules you face and its score is the three-star target.
Can I play Astro Merge on a phone?
Yes, and the layout is built for it. The well, the queue, the goal meter and the three tools all re-flow to the screen you are on, a drag aims and a release drops, and the whole game is one page with no images to download, so it starts instantly on a mobile connection.