Agar.io is a free online game where you control a cell, eat pellets and smaller players, and avoid bigger ones. You split, eject mass and use viruses to climb the leaderboard.
Diep.io is a free top-down tank shooter. Sandbox mode is its official test arena, where you can jump levels and switch tank classes freely to practise builds.
Diep.io is a free top-down tank shooter. You shoot shapes for experience, spend points on upgrades and pick new tank classes at levels 15, 30 and 45 while fighting other players.
Krunker is a fast first-person browser shooter with blocky maps and short online matches. You pick a class, move quickly with slides and jumps, and try to finish top of the scoreboard.
Paper.io 2 is a territory game by Voodoo where you draw loops outside your land to claim more of the map. Rivals can cut your trail, so you must balance big grabs with getting home safely.
There is no official Paper.io 3, so this page covers Paper.io 2 by Voodoo. You draw loops outside your land to claim territory while rivals try to cut your trail.
Slither.io is an online snake game where you eat pellets to grow and try to become the longest snake on the server. You can pick free skins or design your own with the Build a Slither tool.
Slither.io is a free online snake game where you eat pellets to grow and make rivals crash into your body. There is no real invisible skin, but you can design your own.
Smash Karts is a free online kart battle game where you drive around an arena, grab random weapons from crates and blow up other players to win short three minute matches.
Smash Karts is a free online kart battle game by Tall Team where you grab random weapons from crates and blow up rival karts in short matches. The 66 in this name refers to third-party mirror sites, not the developer.
Venge.io is a free browser FPS by OnRush Studio that runs on Chromebooks. There is no safe hack, but ability cards, map knowledge and private room practice give you a fair edge in its objective matches.
ZombsRoyale.io is a free top-down battle royale by End Game Interactive. Up to 100 players parachute in, loot weapons and fight inside a shrinking safe zone.