For this achievement you need to solve 10 puzzles without the 'autopencil' and 'show errors' helpers turned off.
Obviously the easiest and fastest puzzle to earn this on is 6x6.
If you want to speed it up you can use an online solver by inputting the data:6x6
Note: The helpers are automatically turned off online so you can get this whilst going for
The Wired achievement in Buku Sudoku worth 34 pointsComplete 20 games over Xbox LIVE.