I was introduced to these puzzles via croco-puzzle.com, a German site which sells computer-generated puzzle magazines, and which offers 8 free puzzles every week. (They've recently added Fillomino, Hashiwokakero, Heyawake, Hitori, and Masyu to their lineup; I'm hoping they post one of those as one of their free puzzles so I can mercilessly mock their computer-generated suckiness.) Their rules are much laxer; every arrow must point to AT LEAST ONE star, and every star must be pointed to by AT LEAST ONE arrow. In the Janko.at version, I was able to discern the part about every arrow having exactly one star, but not the other way around. :)

By the way, I also got an e-mail from Janko.at asking for permission to use my puzzles. I replied yes. I haven't seen our puzzles used on the site, but our blogs are now part of the Links section, which is the next best thing, eh?