Ball Up: Knife Racing is an online Kids game, it's playable on all smartphones or tablets, such as iPhone, iPad, Samsung and other Apple and android system. Ball Up: Knife Racing is a casual game that tests your reflexes. Feel the rhythm, don't damage the ball and beat your opponents. You can unlock new skins with the rewards you get by passing the levels. It's time to test your reflexes, so if you find it interesting, don't forget to share it with your friends and join in! Have fun!