It is a downloadable game for PC or Mac. I downloaded the free base version. The full version has the same basic facts learning but without the extra levels of complexity. This maths game would really appeal to my gaming Year 4/5 boys. It is really built like the old game Wolfenstein 3D game without the killing. Every now and again you come across an ogre that you neutralise by knowing your tables. I was very impressed with the graphics and the attempts to build number knowledge as well as straight recall. Give it a go. I am sure you will be hooked. I would like to hear what the paid for version ($40US for home use) is like if you decide to buy it. Something for my next year’s class maybe.