Inspired by the this post over at the great bookofjoe blog, I decided to dig deeper into the thrilling and unexplored Sudoku game pen genre.

So, without further ado, here are three of these puzzling writing tools:

Sudoku Pen ($4)

Solve over 10,000 mini puzzles using the built-in keys on this cool pen-and-puzzle combo. Includes two levels of difficulty, sound feature, and timer. Refillable black ink; button cell batteries included. 6″ long.

Retro 51 Sudoku Pencil ($25)

Classic Tornado shape with enameled sudoku graphics on the barrel and chrome trim. Heavy-duty 0.9mm lead extends and retracts with twist action.

View a review of this pencil

Sudoku Game Pen ($6)

This amazing ballpoint pen is also an electronic game featuring over 27,000 challenging Sudoku puzzles! With two modes and three difficultylevels, you’ll have plenty of Sudoku to enjoy, at home or on the go. Features automatic turnoff. Plastic and metal; includes AG 13 battery.6″ long x 1 1/4″ wide.

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