• 

  Agar.io

  Miniclip

  
  Control one or more circular cells in a map representing a Petri dish. The goal is to gain as much mass as possible by eating cells smaller than you while avoiding being eating by larger cells. You start with one cell, but can split into two once your cell reaches a sufficient mass, allowing you to control multiple cells.

  Play Game
• 

  Brutal.io

  Profusion Studios

  
  Join this clever 2D physics game and play in real-time, with millions of players around the world. Control your car and throw your flail against other players. Easy to play, hard to master.

  Play Game
• 

  Creatur.io

  Kooapps Games

  
  This online multiplayer is a cute game with a lot of competition. Level up after you start: choose your custom nickname and begin as a Dogi. Battle others and eat as much as you can for as long as you can. Beware; the other players will try to bite you from behind.

  Play Game
• 

  Lazerdrive.io

  Elao

  
  A real-time multiplayer game in your browser. Don't touch any line or you'll die. Collect stars and kill other lazers.

  Play Game
• 

  Mope.io

  Addicting Games

  
  Survive and climb the food chain in mopeio, the hit browser game. Mope.io is best played in Landscape format. Try out the new Wild Mope Game Mode

  Play Game
• 

  slither.io

  Lowtech Studios

  
  Play against other people online. Can you become the longest slither? If your head touches another player, you will explode and then it's game over. But if others run into YOU, then THEY will explode, and you can eat their remains.

  Play Game
• 

  splix.io

  Jesper the End

  
  Conquer as much land as possible and try to become biggest of them all. In splix.io you have to surround a group of blocks and come back to your own land in order to fill the group of blocks with your color. But watch out, if someone hits your trail you die.

  Play Game
• 

  Tankwars.io

  PlayOn ApS

  
  Awesome tanks are waiting for you. Take aim, fire and destroy your opponents. Compete against players around the world in an epic online tank battle.

  Play Game
• 

  Wormate.io

  Godoba

  
  Eat sweets, donuts and cakes to grow faster. Cut off other players by letting them crash heads into your worm's body. Play with others all over the world.

  Play Game
• 

  Wormax.io

  Elyland

  
  Play Wormax.io online against other people worldwide in multiplayer mode or against the computer in the sandbox mode. Invite friends to slither together. Upgrade your worm and compete with other players in the rating. Use active skills and game boosts.

  Play Game

What are IO Games? IO games are a popular genre of browser games that have been around for a while now. These games are simple and easy to play, yet they can be incredibly addictive and fun. IO games are usually multiplayer games that can be played online with other players from around the world.

Some of the most popular IO games include Slither.io & Agar.io. These games are all free to play and can be played on any device with an internet connection.

Slither.io is a game where you control a snake and try to eat as many pellets as possible without running into other snakes. Agar.io is a game where you control a cell and try to eat other cells to grow bigger.

There are many other IO games out there as well, each with their own unique gameplay mechanics and features. Some of these games are more casual and laid-back, while others are more competitive and intense.

Overall, IO games are a great way to pass the time and have some fun online with friends or strangers from around the world.

About Cooliogames We love IO games. On this website you find a curated list of IO games from game developers and gaming websites that we like. The list is regularly updated with new games. So make sure to come back to see new listings.

Free Games Websites Check out these free game websites to discover new games to play, read the latest news or find reviews of the hottest games.

• Gamesito - Free Online Games
• SolitaireCorner - Free Solitaire Games
• HiddenObjectZone - Free Hidden Object Games
• MahjongTown - Free Mahjong Games
• BubbleShooterBay - Free Bubble Shooter Games
• JigsawPuzzleWeb - Free Jigsaw Puzzle Games
• WordsearchWeb - Free Word Search Games
• PuzzleGameZone - Free Puzzle Games
• CardGameSite - Free Card Games
• CoolioGames - Free IO Games
• KlondikeSolitaireZone - Free Klondike Solitaire Games
• SpiderSolitaireZone - Free Spider Solitaire Games
• FreecellWeb - Free Freecell Solitaire Games
• CasinoGameZone - Online Casino Games