One of the things I did in Prague - more info shortly, promise - was buy a really cheap copy of
River Crossing (called 'Crocodile [something]' there).
And being the sort of person whose response to Sudoku was to write a program to solve the puzzles (starting with one that would do 16x16 ones as well as 9x9) I've written a program to find solutions to this too.
(Ok, one incentive was being a bit stuck on puzzle 38 of the 40 in the box. The solutions are included, but that feels like cheating in a way that writing the solving program doesn't.)
It works :) but several things have surprised me...
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