Boost your mind! kPlayMaths is an application to keep active and fast your brain playing maths.
It is designed for kids and adults. You can customize the operations digits, the time available to complete the operation and the total exercise time. This way you could change the hardness of the game.
You could also customize the writing direction (left-to-right or right-to-left) in order to be more similar to the method you are used to; or simply to make harder the game.
At last, before starting a game you could choose the operation you want to train or make it random.
Once you have played a couple of games with the same operation you could view the evolution graphs.
If you like kPlayMaths, please take the time to give me a nice review: it really helps.