Like sudoku, O'Ekaki (Paint by Numbers) provides an entertaining test of one's logic, using a grid as its playing field. But rather than leaving the player with boxes of numbers, O'Ekaki ends with a flourish: a fun piece of art that seems to magically appear when you've correctly darkened the final square grid. And each puzzle's title is an amusing clue to the picture that will ultimately emerge. The puzzle challenge on several levels, from beginning to expert, all resulting in a sometimes elaborate picture.

And every one is designed by the inventor of O'Ekaki himself!