The Latest Easy Puzzles, now in an very child-friendly 4x4 format just for kids Your kids will want to start solving these child-friendly puzzles and will have a lot of fun with these small sudokus that are right for them. These puzzles are much simpler, guaranteeing repeated success, without frustrations. Half the puzzle use the letters A B C D, the other half are using the numbers 1,2,3,4At the same time, children are building their skills and experience. An introduction teaches the basic sudoku rules and offers easy-to-follow hints on how to figure out where the numbers/letters go.