Here’s another maths app review.
This game has different levels that are unlocked as you go through. In general, I find this to be a good structure for games.
The main bulk of the game involves moving two sliders to make the answer given. Each slider controls numbers in a certain times table (which you’re not explicitly told) and seem to go into negative numbers frequently. The game isn’t too bad but it’s far too hard to start with. I would consider using this with some high ability students that were looking for a challenge but I don’t think the game is particularly engaging. It didn’t make me want to keep playing so if it’s just about practising something lots of times then I can probably think of another way.