EvoWorld.io, formerly titled FlyOrDie.io, is a 2D .io game that is similar to Mope.io. In the game, a player controls his/her Animal. The Animal needs to eat green-circled entities to gain experience to evolve, while dodging red-circled entities as they will harm the Animal.

The player also needs to maintain the Animal's water and oxygen levels, as losing either one can lead to death.