First, the Sudoku sheets: the square grid background from Off Beat Backgrounds was used on white paper, and punched out with a 1 1/4" square punch. The extra lines on the edges were "whited out" with a white gel pen. Then I used a Copic multiliner pen to add the numbers (from real Sudoku puzzles). The orange and yellow starred panel was made by punching stars out of the orange strip (SU Only Orange) and inserting punched out yellow (SU Yoyo Yellow) stars. The blue strips are SU Ballet Blue. Sentiment is provided by the Say It Loud set, and I added a brass star to the Sudoku stack. The tiny orange dots were applied using a Sakura opaque gel pen.
I think he'll like it, for variety if for no other reason.