From GameBrew - a wiki dedicated to Video Game Homebrew.
MathOp (French) is a DS homebrew math game in which you must solve 20 basic operations (x, +, -) as fast as possible.
At the end of the countdown, the game begins and the first operation will be presented to you.
You must enter the answer using the touch screen, and confirm with the OK button.
If it turns out that you make a typing error, press the CLEAR button to erase your result.
A penalty of 5 seconds is given for any wrong answer.
Operate with Stylus.