This is a game of math and numbers. You will be presented with a grid of pieces containing random numbers between 5-50. The goal is to pull pieces from the grid in groups that total 100 (or as close to 100 as possible). For instance, you if you playing a 13, 47, 30 and 10 together would comstitute a 100 group.
Being able to perform a little mental math is not only useful, but it is also an effective way to exercise your mind in everyday situations as it subtly works out a variety of mental processes. This might be one of the most rewarding things to exercise as your progress will be immediate and clear. The games here offer you several different ways to work with numbers and improve these skills.