It's a very simple game: quickly answer some math questions or die. I do have a bias towards quick trivia or quick response games like this, so it was fun at first, but I answered dozens of math problems and it just never ended. I guess there's no way to win, you just play until you are killed by the ghost. And that's fine, the music is pretty creepy and maintains a stressful atmosphere to make it harder so that's good design, but it doesn't loop correctly, it will just end. The ghost is a bit scary but it's also completely lit and bright, there's very little scare factor. It's a great motivator for a young child to get good at simple addition. 10/10