Buku Sudoku is worth your time but it won't replace your pen-and-paper version. Many will want to have Sudoku on the go rather than static on your 360. At the cost of 800 Microsoft points ($10), it's hard to justify the price of Buku Sudoku due to the ability to play for free in your local newspaper.
Gameplay - 6.0
Graphics - 5.7
Sound - 5.5
Difficulty - Easy/Medium
Concept - 7.0
Multiplayer - 4.0
Overall -
5.8/10