In Rusherio game, you have to grow the spheres which are small when you start the game. The hexagons in the game will help you in growing of the sphere. You have to use the left arrows to move the sphere and the hexagons and eat them to grow in size. The speed can be boosted easily with the left arrow.
You can update about the Rusher.io game on your social media so that your friends come to know of the game and you can challenge your friends in this great game.