Inaba Naoki is one of the most creative puzzle authors of the world. On his Japanese Website you can fine about 400 puzzle types and 2000 puzzles. We use some of these puzzles with his permission.
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For each puzzle type there are 4~5 puzzles, in most cases in increasing size and increasing difficulty. The puzzles can be solved interactively or printed (in most cases all puzzles fit on a single page).
All puzzles have been created by Inaba Naoki and have been published on his Website. We use the puzzles with permission by Inaba Naoki.