The best io games to play free in your browser
The best io games right now are agar.io and slither.io for pure arcade, krunker.io for shooting, diep.io for strategy, paper.io 2 for tension and skribbl.io for playing with friends. All are free, all run in a browser tab, and none of them need a download or an account.
The best io games, ranked by what you want from one
"Best" is not one list, because these games are not competing for the same twenty minutes. What follows is ordered roughly by how influential and how well-populated each game is, with a note on who each one is actually for. One of them is ours and is labelled as such.
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agar.io
Cell eating
The 2015 game that created the genre. Absorb smaller cells, split to chase, avoid being absorbed. Still the purest idea in io gaming.
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slither.io
Worm
The most played io game ever made. One rule — head into body kills — and it has not needed another one in a decade.
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krunker.io
First-person shooter
A genuinely fast browser FPS with movement mechanics deep enough to have a competitive scene. Runs on hardware that cannot open most shooters.
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diep.io
Tank shooter
Level up a tank, choose upgrade branches, out-position everyone else. The most strategic game on this list.
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paper.io 2
Territory
Claim territory by looping around it while everyone tries to cut your trail. Tense in a way none of the others are.
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Squirm.io our game
Worm
Our own worm game. Constant speed at every size so small worms stay dangerous, cosmetic-only skins and no power-ups.
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skribbl.io
Drawing and guessing
Draw and guess with friends. The only game here you would put on in the background of a call, and the best io game for a group.
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moomoo.io
Survival crafting
Gather resources, build a base, defend it from other players. Closer to a survival game than an arcade one.
What makes an io game good
The genre's real problem is empty arenas. An io game with nobody in it is not a hard game, it is a blank screen, and most of the hundreds of io games released each year die of that. Before anything else, check whether the arena feels alive ten seconds in.
After that: can you understand the rule that kills you without reading anything, and is there a way for a small player to beat a big one? A game that fails the second question turns into a farm for whoever got there first.
Frequently asked questions
What is the best io game?
It depends what you want. agar.io and slither.io are the purest arcade loops, krunker.io is the best browser shooter, skribbl.io is the best io game to play with friends, and diep.io is the most strategic. All are free and need no download.
Are io games free?
Yes. io games are free to play in a browser and make money from advertising and cosmetic purchases rather than an upfront price.
Do io games work on school computers?
Often, because they are web pages rather than installable software, so a policy that blocks installing games does not block them. If the network itself blocks the site, nothing on the page will change that.
What does the io in io games mean?
.io is a domain suffix, originally the country code for the British Indian Ocean Territory. It was popular with early browser multiplayer games like agar.io, and the name stuck to the whole genre regardless of what domain a game now uses.
Play Squirm.io Free Our own worm game — free, no download.