Someone I know was trying to work on her sudoku, so I came up with a little song to cheer her on, until she threatened to throw something at me. Here it is (revealing just how much Japanese my 14-year-old self managed to absorb).
Kore-wa, watashi-wa, sudoku, sudoku
Kumamoto, Yatsushiro, sudoku-san
Hajimemashita Fujiyama moshi-moshi
Boku-wa, watashi-wa, sudoku-san
The trick is to sing like you’re an eight-year-old Japanese girl wearing a sailor suit in a TV commercial for dried shrimp.