Reworked the generator for Maths Maze, to make the solutions a little less simple.[/highlight]
A slight tweak to the Maths Maze generator, as it was making some puzzles far far too easy.

I've now added a "20 or above" limit to the goal, which should help increase the difficulty level a little, as the previous day's puzzles all seemed to be a little too simplistic.
I might yet tweak it a bit further to avoid repetition, but for now it's good enough.

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