I've made a puzzle from the set of 12 pentominoes, plus the square

tetromino. The shapes are labelled with one of the numbers 1-8 on each

square. You have to try and fit them into an 8x8 square so that each

row and each column contains the numbers 1-8. You'll find it here:

http://uk.geocities.com/aidan_001/puzzles2.html

There are over 16000 ways of putting the shapes into the 8x8 square,

but I don't know how many of them will also solve my puzzle (at least

one will). Also as several of the shapes have symmetries, by putting

numbers on them you can multiply this total by some power of 2 . It'd

be nice to create a version of this that has a unique solution.