Agar.io

Size determines everything: who eats and who gets eaten.

Reference source: CrazyGames game page (external link, opens in a new tab)

Glide your cell across a microscopic arena, absorbing smaller cells to grow and evading anything bigger than you. Split your cell to hunt down fleeing opponents or cooperate with others in pack tactics. Guide your cell with the mouse and press Space to split. Playable in any web browser.

Keys & Controls

  1. Mouse movement
  2. space to split cell

Key Features

  • Cooperation through cell splitting creates pack hunting

  • Virus cells provide hiding spots for smaller players

  • Movement slows as cell grows, requiring tactical play

  • Simple two-rule mechanic with surprising strategic depth

  • Originated the .io genre of browser games

Quick Guide

  1. Open Agar.io

  2. Move with your mouse

  3. Consume smaller cells to grow

  4. Use virus cells for cover

Grow, Split, Dominate

Questions & Answers

What does the player control in Agar.io?

The player controls a circular cell moving through a microscopic arena. The cell grows larger by consuming smaller cells and must avoid being consumed by larger ones.

How does the split mechanic work?

Pressing the spacebar splits the player's cell into two smaller pieces that fly outward. Players use this to capture smaller cells at speed or to cooperate with another player in coordinated hunting.

Does growing larger make the game easier?

Not entirely. As the player's cell grows, it moves more slowly, which requires more deliberate positioning and tactical awareness rather than simply overpowering smaller opponents.

What role do virus cells play?

Virus cells in the arena act as cover for smaller players. A smaller cell can hide near or behind a virus cell, since larger cells that contact a virus are split into fragments.

Can players cooperate with each other?

Yes. Two players can coordinate by using the split mechanic to feed each other mass or to trap a third player between them. This pack-hunting approach is one of the game's more advanced strategies.

What is the win condition in Agar.io?

The player's goal is to become the largest cell in the arena by consuming as many smaller cells as possible. There is no fixed end point — the arena is ongoing and competitive throughout.

How is Agar.io controlled?

The player's cell follows mouse cursor movement around the arena. Pressing the spacebar splits the cell, which is the only additional input the game requires.