Agar.io turned a single rule into one of the stickiest browser games ever made: grow by eating, avoid anything bigger, split when it helps. It became the game people fired up between classes and during work breaks precisely because it asked for nothing, no install, no account, just a tab. We wanted that same instant, no-download feel, so we built Mitosis, our own cell arena in the same spirit that loads right here on this page. No app store, no signup, nothing to install on a locked-down school or office network.
Play Mitosis now
Move your mouse or drag on a phone to steer. Tap the split button, or press Space on desktop, to split your cell.
How to play
Your cell follows your cursor or finger. Roll over the small dots scattered across the arena to grow, and steer wide of any cell that reads bigger than yours, since it can swallow you the same way you swallow smaller ones. Once your cell has enough mass, split it into two: the new piece launches ahead in the direction you are aiming, useful for grabbing a cell that would otherwise dodge you, or for putting distance between you and a predator before the two halves quietly merge back together.
Each day sets a fresh target mass, shown in the arena chip when you start. Reach it in a single run to bank a streak. Your best mass and your streak are saved on your device only. Nothing leaves your browser, and there is nothing to sign in for.
How it compares to Agar.io
Mitosis keeps the exact loop that makes Agar.io work: eat to grow, split to strike or escape, stay alert for anything bigger than you. Cell growth, the split mechanic, and the constant read-the-arena tension are all here, and a run lasts the same couple of minutes before you either overreach or clear the daily target.
The honest difference is what the arena is made of. Agar.io is a live multiplayer game, your cell shares the map with real players around the world, and the best moments come from outsmarting a person, not a script. Mitosis is single-player: the other cells in our arena are AI-controlled, built to hunt, flee, and graze on their own logic, not to connect you with strangers. We also left out skins, coins, leaderboards, and party modes entirely.
If you enjoy the loop here and want the real stakes of playing against actual people, cells, gifts, and a much bigger arena, that is exactly when to grab the official Agar.io app. Think of Mitosis as the free, no-download warm-up, and the real thing as where the loop goes when other players are involved.
Get the full game
Agar.io is free to download from Miniclip, with the full live multiplayer arena, cosmetic skins, and party mode for playing with friends. It works on Android and iOS.
Frequently asked questions
Can I play Agar.io unblocked at school or work?
Mitosis runs entirely in the page, with no install and no app to get flagged by a network filter, so it loads on locked-down school and office connections the same way any web page does. It is not Agar.io itself, but it gives you the same grow-and-split loop without needing to install anything.
Is this the real Agar.io?
No. Mitosis is an original game we built, inspired by the loop Agar.io made popular. It is not affiliated with, endorsed by, or connected to Miniclip in any way. Every cell, arena, and sound in our version is original work, and the download links above point to the official app.
Is Mitosis multiplayer like the real Agar.io?
No, and we want to be upfront about that. The real Agar.io puts you in a shared arena against actual players. Mitosis is single-player: every other cell you see is controlled by our own AI, built to graze, hunt, and flee on its own. It is the closest we can get to the feel of Agar.io without a live server behind it. For real opponents, install the official app.
Is it free?
Completely. No ads, no purchases, no accounts, and nothing tracked. Your best mass and your daily streak live in your browser’s local storage and never leave your device.
Does it work offline?
Once Mitosis has loaded, it makes no further network requests, so a dropped connection will not interrupt a run. The official Agar.io app needs a live connection to reach its multiplayer servers, so for offline play, Mitosis is actually the better option of the two.
