A wrong equation needs to get corrected by you.
The goal of the game is to correct it as fast as you can. Do not move more than the minimal number of matchsticks or you will lose points.
The game contains normal numbers, roman numerals and a Leveleditor where you can build your own levels.
Take a look at the Google play store for some pictures and a video…
https://play.google.com/store/apps/details?id=com.smallapps.streichholzspiel&hl=en