The forerunner to Fifteen Up
Fifteen is another Sudoku-style numbers game. Unlike Sudoku though, this one does require you to do some arithmetic. But don't worry; as the name suggests, you only have to count as far as fifteen.
A Fifteen puzzle takes the form of a square grid of numbers (surprise!) like the one below:
The challenge is to divide the grid into 15 regions, with the numbers in each region totalling 15.
However, there is one important restriction. Every region must be square
or rectangular. L-shapes, T-shapes or any other funny shapes that might take
your fancy are not permitted.
Click here for a printable version of the sample puzzle above.
Here are some more Fifteen puzzles for you to have a go at:
Added 8 February 2008:
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