Matobox

Matobox is a game designed to train you in mental arithmetic while playing an extremely fun game.
It offers different levels of difficulty to allow you to always play with pleasure.
You can even submit your score if you succeed in the game! But be warned, the world is full of little geniuses who are particularly good at math, and making it into the top 20 is not for the faint of heart! Unless you are a genius yourself...