Go! Sudoku
go-sudoku.com
Official site. Offers tips and hints, screen shots, game background, and online play. Available in English, French, Dutch, Danish, Italian, Norwegian, Swedish, Finnish, Spanish, Portuguese, and German. [Requires Flash]
GameSpot
gamespot.com
Overview, screen shots, and player reviews.
Xtra Games
games.xtra.co.nz
Reviewed by Sonia Robinson. "For now I'm well and truly happy in the novice category - just getting to grips with getting the right combination of numbers keeps me entertained for hours."