Agar.ioControl a hungry cell, absorb pellets to expand, and outmaneuver rivals in Agar.io, an arena survival game you can play free in your browser.
Agar.io
What is Agar.io?
Agar.io is a 2D multiplayer .io survival game developed by Miniclip, originally launched in 2015. Players direct an individual cell across a shared grid, consuming tiny floating pellets and smaller opponents to expand while evading giants that can swallow them whole. Unlike games with fixed character attributes, your scale dictates your speed: tiny cells dash swiftly across the board, whereas colossal cells turn into sluggish targets vulnerable to tactical splits. Agar.io runs directly in modern web browsers with zero installation requirements, letting anyone join an active match immediately.
Key features
- Mass accumulation: Consuming stationary pellets and smaller rivals steadily expands your diameter and raises your position on the leaderboard.
- Cell splitting: Dividing your mass launches one fragment forward, allowing you to capture fleeing prey at the cost of temporary vulnerability.
- Mass ejection: Shooting mass allows you to shed weight for speed, bait other cells, or feed environmental hazards.
- Spiked viruses: Green obstacles provide safety shelters for compact cells while causing overgrown competitors to rupture upon contact.
- Multiple play styles: Four distinct game setups offer solitary survival, team-based battles, and shrinking arena challenges.
How to play
- Spawn into the active arena as a tiny beginner cell surrounded by floating pellets and competing players.
- Sweep across open floor space to consume pellets and steadily build up your starting mass.
- Steer clear of any rival larger than your cell, taking shelter behind green viruses if a predator pursues you.
- Target organisms smaller than yourself once you gain momentum, cornering them along map edges.
- Press Space to split your cell in half when a target is within reach, lunging across the gap to engulf it.
- Recombine your separated halves over time while defending against rival attacks to maintain your rank.
Controls
| Action | Keyboard / mouse |
|---|---|
| Steer cell direction | Move mouse |
| Divide cell in half | Space |
| Eject mass piece | W |
Mass and virus mechanics
Mass determines everything in an arena match. At tiny sizes, your organism glides rapidly across the surface, giving you agile escape angles against sluggish behemoths. As your mass swells, your travel rate decreases, requiring you to anticipate rival routes rather than chasing them in straight paths.
Green spiked viruses add strategic depth to arena navigation. Because viruses pop cells that exceed their diameter, small organisms can safely hide inside or behind them to deter giants. When you become large enough, you can press W repeatedly to fire mass directly into a virus. Feeding a virus pushes a fresh spiky hazard across the floor, which can rupture an enemy giant into scattered pieces for you to consume.
Tips and strategy
- Patrol the outer borders early: The perimeter of the grid has fewer giant predators, making it safer to collect starting pellets without getting ambushed.
- Use viruses as shields: Ducking behind or inside green viruses keeps you safe from massive rivals because colliding with a virus ruptures large cells.
- Split with strict caution: Splitting halves your mass across two bodies, so only divide when your divided half is noticeably larger than your prey.
- Trap rivals against walls: Opponents have fewer escape routes near the arena edges, giving you an easy angle to pin and absorb them.
- Watch before rejoining: After splitting, your separate pieces take time to merge back together, leaving both halves vulnerable to opportunistic competitors.
Game modes
FFA
Free For All pits every player against everyone else in a continuous arena where survival depends solely on individual skill and vigilance.
Battle Royale
Battle Royale drops players into a shrinking arena boundary where everyone fights for survival until only one dominant cell remains standing.
Teams
Teams splits competitors into two color-coded factions, letting teammates collaborate to corner opposing cells and claim territorial dominance.
Experimental
Experimental mode introduces alternative arena mechanics, including special spawning nodes where players can donate mass to receive additional pellets.
Similar games
If you enjoy the competitive survival loop of Agar.io, explore these related titles:
- Crazysteveio: A fast multiplayer arena game focused on gathering diamonds and throwing explosives to defeat rivals.
- YoHoHo.io: A pirate-themed battle game where you collect coins on an island while evading a closing safe zone.
- Gulper Io: A neon snake-style arena game where quick movement and tactical cutoffs help you consume fallen energy.
The game also gained widespread popularity across mobile platforms alongside its classic browser release.
Developer and history
Agar.io was developed by Miniclip, with the concept originally designed by Brazilian creator Matheus Valadares in 2015. After its public unveiling in April 2015, the project gained massive attention worldwide and inspired an entire wave of browser-based multiplayer arena games.