starve.io - Starve.io is a survival game.

Agar.io - The smash hit game! Control your cell and eat other players to grow larger! Play with millions of players around the world and try to become the biggest cell of all!

MooMoo.io - a game of defense against other players to see who can get the best armor and most gold.

Slither.io - Slither.io is a multiplayer online video game. Players control an avatar resembling a worm, which consumes multicolored pellets, both from other players and ones that naturally spawn on the map in the game, to grow in size.

Osmos - The full game includes 47 levels (plus "infinite" bonus content) across 8 distinct level...

Unturned - You're a survivor in the zombie infested ruins of society, and must work with your friends and forge alliances to remain among the living.