.io Arenas

Be a cell, eat smaller cells, flee larger ones and split to ambush. The game that invented this entire genre in 2015.

Browser Minecraft with party modes bolted on — parkour, bed wars, one-block survival — and multiplayer that joins in one click.

Physics sumo where everybody is a circle, the only verb is shove, and the arena keeps getting smaller until someone falls off.

Start as a shrimp, eat, evolve into something with teeth, and repeat in an ocean full of players doing exactly the same thing.

A tank shooting polygons for experience, then branching down a surprisingly deep upgrade tree, from the maker of Agar.io.

A gentler descendant of Diep.io where you assemble a ring of petals around a flower and farm increasingly rude insects.

A voxel arena shooter that holds a high frame rate in a browser tab, with custom lobbies, a map editor and no install.

Capture the flag with bows and low-poly castles, where arcing a shot over a wall beats raw reflexes almost every time.

Claim territory by driving loops around it while everyone else tries to clip your tail before you make it home.

A first-person shooter in which every player is an egg and every hit is messy. Considerably better than that premise deserves.

Grow a snake on glowing pellets and cut other players off so they burst into more of them. The .io boom started here.

The community revival of surviv.io, the sharp little 2D battle royale that was shut down and flatly refused to stay dead.

Hundreds of players carve up a real world map using one attack slider. Diplomacy emerges in the chat within ninety seconds.

Top-down battle royale for a hundred players with a full match inside five minutes, no download and no launcher to update.