David Skinner released this collection of 50 original levels in January, 1999. He calls them "Sasquatch".
The levels are generally of just the right difficulty to be fun: not too easy, but (usually) not so hard that you get frustrated.
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From David Holland on Jun 8, 2001
Difficulty: 4: Requires considerable thought
I found this collection to be a real page-turner: I couldn't wait to try the next puzzle. It is packed with ideas, flair and not a little beauty. As a moderately experienced solver, only a handful of the puzzles required more than one session - this is not intended as a criticism! - and even these sustained my interest to be solved after a break of a few days. I was most impressed with the paradoxical consistency combined with the variety of the puzzles. Some of the "stacking problems" were delightfully original. I admired the elegance of the symmetrical puzzles, especially when combined with unexpected solving difficulty (change of role and very unsymmetrical variations). Not least, I was inspired by this collection to make some more puzzles of my own and got a real sense of limitless horizons within this puzzling realm of Sokoban.