HoMaM

In Heroes of Math and Magic you solve fun math puzzles and fight other heroes for honour and glory.

Heroes of Math and Magic combines learning with a hero themed maze and action game. Walk the maze in the correct order to answer the question and battle monsters to unlock new heroes.

Covers ages from 7 to 12 with math puzzles of increasing complexity from basic addition of single digit numbers, greater than/less than, neighbours and sequences all the way up to building simple equations.

Each category has an infinite number of randomly generated puzzles.

Here is a nice review on the Educational App Store