- Great way for kids to do subtraction drills the fun way. Let them become very good at subtracting numbers, which is an important life skill. "Son, do the drills now. Show me some progress before you play the other games." - Challenge your kid to complete the sums in record time and come back later to check his performance history. - Select one or more subtraction levels and start the game! - Earn trophies and the rare golden star for record performance. - Keep track of your scores and speed. - Compete with friends, family members and the rest of the world! - Check out your country ranking and world ranking. Beat the current world record - Visit our support website for more info and a video demo: www.therocketstudio.com/subwiz