Ian Finch recently contacted me about his game Numplussed - Connect Numbers in a Math Puzzle Maze.  Long title, but it describes what to do.
  The object is to move the white dot in the maze to match the target number on top.
The White dot can retrace its steps.  Directional arrows force movement in 1 direction.
Passing through a diagonal line: that's not division. It means that that spot will become a wall.  Some parts of the maze must be traversed multiple times.
There are 125 free levels.   I've done about 40 levels. You can buy 300,000 levels. I'm not sure, but I think that could be a record. Of course, some puzzle apps generate an infinite number of levels.
https://itunes.apple.com/us/app/numplussed-connect-numbers-in-a-math-puzzle-maze/id1193295317"mt=8

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