If you like puzzles like this, you should check out Nikoli (http://www.nikoli.com/en/ http://www.nikoli.com/en/). They're a Japanese gaming company with a bunch

If you like puzzles like this, you should check out Nikoli (http://www.nikoli.com/en/ http://www.nikoli.com/en/). They're a Japanese gaming company with a bunch of puzzles online. They don't have this particular puzzle, but they have similar ones, like Hitori (http://www.nikoli.com/en/puzzles/hitori/ http://www.nikoli.com/en/puzzles/hitori/).