Ant ColonySkill·Free to play
Agar.io
Absorb pellets and smaller blobs to grow while escaping the bigger ones hunting you.
Independent browser adaptation · Not an official releaseSign in to save your scores and play history, or keep playing as a guest. Recent game activity and scores appear on the homepage with a masked email or IP address.
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Keyboard & touch controls
Mouse / TouchSteer toward the pointerArrows / WASDSteerSpaceSplitXEject massPPause
How to play Agar.io
Steer toward the pointer
Your blob follows the mouse or your finger; arrows and WASD work too. You always move at full speed for your size, so direction is the only thing you control.
Graze pellets to grow
The colored dots are free mass. Sweep through dense patches early to build a working size before the rivals take an interest in you.
Absorb smaller blobs
Touch a rival you clearly outweigh and it is yours, worth big points and a chunk of its mass. The red outline marks blobs that can do the same to you.
Respect the speed trade
Mass slows you down. Small blobs can outrun every threat; giants cannot outrun anything and must win by positioning instead.
Watch the whole neighborhood
The camera follows you across a much larger world. Check what is drifting in from off-screen before committing to a chase.
This independent browser adaptation uses the original game’s established title. It is not an official publisher release or an original ROM. Its artwork, tuning and controls may differ from other games with similar rules. Guest personal bests stay in this browser. Signed-in players can also save scores and play history to their private dashboard; there is no global leaderboard. Read about controls and local storage.
Choose a related challenge
Growing changes which nearby blobs are dangerous. Ant Colony makes collecting a return trip: carry crumbs home while avoiding the threats around the anthill.
What Agar.io is like to play
Agar.io is the cell-eat-cell world in single-player form: one huge scrolling petri dish, a floor scattered with glowing pellets, and eleven rival blobs with names, appetites and no manners. You start as a modest green cell, graze pellets to put on mass, and quickly learn the arena's only law: bigger absorbs smaller, always and instantly. Every rival is living the same life, wandering the grid, snacking, sizing you up. When one outweighs you it will chase; when you outweigh it, the chase reverses. Mass is speed's enemy, so every meal that makes you scarier also makes you slower, and the arena's balance of power shifts with every bite anyone takes. Eaten rivals respawn fresh and hungry at the far edges, so the hunt never runs dry. Your score tracks mass and kills together, and every restart seeds a fresh arena, so survival of the fattest is a contest between you and the best run you have managed so far.
Agar.io at a glance
| Genre | Browser Skill Games |
|---|---|
| Challenge | Size math at escape velocity |
| Pace | Graze, chase, panic, repeat |
| Original era | 2015 (browser arena era) |
| Players | Single player |
| Controls | Mouse / Touch, Arrows / WASD, Space, X |
| Cost | Free, with no account and no download |
Where Agar.io came from
In 2015 a minimalist browser game about circles eating circles became one of the most played things on the internet. Its genius was the instant readability of mass: every encounter's outcome was visible before it happened, and yet the map stayed terrifying because you could never watch every direction at once. It spawned an entire genre of browser arena games and made the food-chain loop the defining mechanic of casual multiplayer for a decade.
Agar.io is our single-player tribute to that idea. Instead of a server full of strangers, you face a persistent cast of named rivals driven by the same hungers, and every restart builds them a brand new universe to be hungry in. The physics of the genre survive intact: mass is power, mass is slowness, and appetite is destiny.
Ways people play Agar.io
- Cell arenas
- The founding form: a flat plane, drifting pellets and the pure arithmetic of who outweighs whom.
- Snake arenas
- A sibling branch swaps blobs for growing serpents where length, not mass, is the weapon and the weakness.
- Territory arenas
- Another branch scores claimed ground instead of body size; our Paper.io machine explores exactly that lineage.
- Split-and-merge tactics
- Multiplayer versions let giants split to catch runners, a risk-reward mechanic that defined the genre's high-level play.
Agar.io questions and answers
How much bigger do I need to be to eat a rival?
About 12 percent heavier. Below that margin you simply bump. The red outline shows exactly which blobs currently out-mass you enough to be lethal.
Do eaten rivals come back?
Yes. The arena keeps eleven rivals alive, and replacements spawn at the distant edges sized relative to you, so the difficulty tracks your growth.
What decides my score?
A mix of your peak mass and blobs absorbed. Grazing builds the floor; hunting builds the headline.
Is there a size limit?
Growth slows sharply as you get huge and caps before you can blot out the arena, keeping the endgame about hunting rather than inflation.
Is the arena the same every time?
No. Each restart lays out a new pellet field and new rival spawns, so no two arenas hand you the same opening.
If you like Agar.io, try these next
Four games from the same shelf, each with its own pace. The one-line summaries are how their own pages describe them.
| Game | What it is like | Pace | Play |
|---|---|---|---|
| Ant Colony | Feed the colony. Dodge the bullies. Fear the glass. | More bullies, hotter sun | Play |
| Fishy | Eat what fits in your mouth. Flee what doesn't. | Calm reef, sudden panic | Play |
Browser skill games: practice the next move.
Separate anticipation, reaction and continuous steering so you can tell what an attempt actually teaches.
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