From Peter Li:
No more calculators! Become amazing at 2 digit subtraction! * Boost daily productivity. Keep your mind active. * Earn all achievements. Compete on Leaderboards. (Game Center)Background: Everyday we come across situations where we need to do quick math operations and most of the time we just reach for the calculator and punch numbers. This game will help you rely less on that calculator and hopefully in time you will be proficient in mental 2 digit subtraction. Features: - Stylish and intuitive user interface - Subtract numbers from 10 to 99 as fast as possible - 2 modes: PLAY & WORK - STATISTICS: Track your best score, average score and total games played - Share scores with family and friends - Game Center Leaderboards & Achievements supported ** PLAY Solve subtraction questions as fast as you can in one minute to achieve a high score! Can you reach the coveted "S" rank? ** WORKUnlimited training time will further prepare you for the 1 minute subtraction marathon. ** SHARE Share your results with friends and family through Facebook, Twitter, Sina Weibo, etc. Find out who among you is a Subtraction Master!