The Jcwd is the logic game for solving single and multicolor Japanese puzzles. Japanese puzzles (also known as Paint by Numbers, Griddlers, Nonograms or Japanese Crosswords) are puzzles with hidden picture. If the puzzle is solved correctly, the picture will appear little by little. You can download the Japanese Puzzles Collection (a total of 440 puzzles) from my site. Some of those puzzles are simple, but some are pretty difficult.