It's the new Sudoku! And it's taking the
world by storm. Unlike in Sudoku where the numbers could just as easily be
letters or shapes or farm animals, 15UP really does require you to do
some arithmetic. Nothing complicated mind you, just enough to impress your
The rules of 15UP are simple. The challenge is to divide the grid into
15 regions, with the numbers in each region totaling 15.
The regions can be any shape, so long as the sum of the numbers in each
region is 15. All the numbers are used; there won't be any gaps or disjoint
regions in the completed puzzle.