Sudoku Under the Sea is the perfect way to introduce your kids or students to this mind stimulating logic puzzle. There are 108 puzzles in this printable book: 36 four by four grids, 36 six by six grids, and 36 nine by nine grids. The PDF gradually introduces more difficult puzzles as it progresses, so beginners will not be discouraged.

The printable PDF contains a total of 63 pages and you can print out whichever ones you wish to use. Each page features a friendly sea creature that gives the kids an idea how hard the puzzle is. We limited the graphics to black and white to keep your printing costs down.