Slush.io is a free online race and io game. Welcome to the great big race in the sky where you can make your very own custom courses and go nuts. This is a platform based racing game where you can create your very own custom race tracks by simply drawing a few lines. Slush.io, racing game, IO game, custom tracks, 2D racing, multiplayer, online racing, free online games, vehicle customization, track editor, racing simulator, platformer, mobile gaming, online multiplayer, 2D game, racing competition