Slither.io was first and very popular snake (or worm) IO game. Many nice worm-like games were released after Slither.io. In Slither.io-like game you are usually play a worm or a snake, eat some food and grow longer. The longer you are — higher is your score and leaderboard position. You can cross (or collide) with your own snake. However, collision with opponent’s snake is usually leads to game over. In some games you will find special bonuses that give you some unique abilities for a short period of time.