Maths Twister - Maths with a twist or two. Free. "highly educational" "fun" "cool" - some of the terms used to describe the game by Dan Galpin and Ian Ni-Lewis in Android Developers - The Friday Games Review on 12-Oct-12. How to play? 1. Select the game and level you want to play. 2. Stop the bars from hitting the bottom by clicking the button with the right answer. Beware!