NumBotsLog on to Numbots using your Times Table Rock Stars log in details. It includes a series of challenges to practice addition and subtraction facts. Story Mode is set out as a series of Stages (Rust, Tin, Iron, etc) containing levels, a bit like Angry Birds. Rust is the first Stage and level 1 is unlocked, so this is the place for everyone to start. To unlock the next level, players need to earn two stars. Challenge Mode is locked for new users and is unlocked once players reach a certain level on Story Mode. It’s currently set to unlock part way through Tin stage.