Music Sudoku Six-Square, Set 1 composed by Geoffrey R. Lorenz. Easy. Games. Published by Heritage Music Press (LO.30-2298H).
Like the familiar number version, the rules for solving these puzzles are simple: put one--and only one--whole, half, quarter and eighth note, and whole and half rest in each row, column and 3x2 box within the bigger grid. This set of six-square puzzles includes three levels of difficulty--easy, medium-easy and medium. Each of the 24 puzzles is labeled accordingly and the puzzles get progressively harder as you move to the end. None are as challenging as the nine-square puzzles, though, which makes them perfect anytime you're on-the-go and find yourself not going. You'll want to keep this in your purse, briefcase, bag, or music tote, because once you start, you won't be able to stop.