MathGame, unsurprisingly, is a mathematics game for junior schoolchildren and above. It features different game modes and difficulty settings, to suit the child.
The game in MathGame is essentially a timer, which challenges you to speed up your calculations. The game mechanic is simple - solve addition, subtraction, division or multiplication problems. There are no fancy graphics, or anything particularly innovative about it. It's good for parents who want their kids to practice mathematics, and maybe the high score table and against the clock gameplay are enough to entice them to play.
If your child hates maths, MathGame is not going to change their minds, as it doesn't do anything to make it fun! For adults, while it may be interesting to see how much of your times table you've forgotten, MathGame is so much less sophisticated that Nintendo's Brain Training games it looks pretty dull. Unless you donate to the developers, upon closing the game, you have to wait for a "nag window" to close, which is quite irritating.
Unless you or your children enjoy doing simple calculations, you're unlikely to find much to enjoy with MathGame.