If you’re a Sudoku enthusiast, then I don’t have to tell you just how fun and addicting the number-based puzzle game can be. Windows phones are perfect for taking that addiction on the go. Panoramic Software, creators of moTweets, has recently updated their Sudoku app. Ultimate Sudoku now features a new game mode called KenKen, another difficulty level, and supports more languages.

Ultimate Sudoku stands out compared to the competition because it has multiple game variants, skins (custom backgrounds too), and a wide range of difficulty levels. It supports virtually every Windows phone with a touchscreen and is available on Panoramic Software’s website (also Marketplace) for a reasonable $2.99. Of course, we’re also giving away 5 copies for those hardcore Sudoku fans out there, so learn how you can win below!

Giveaway: we’re giving out a handful of copies of Ultimate Sudoku to 5 lucky gamers. To win, simply Retweet this post on Twitter (hit the RT button below) and please indicate that you want it, that’s all. I’ll randomly select winners on May 16 at 2AM Eastern. (winners have been picked, thanks for playing)

The guys at Panoramic Software will be holding a contest of their own on Facebook soon, so stay tuned to their fan page for that info.

Main Features:

• Four Challenging games included: Sudoku, Killer Sudoku, Kakuro & KenKen

• Ten Skins to choose from with multiple background colors

• Choose or take a picture with your device camera and set that as your game background image

• Over 1 billion possible puzzles

• Game state always saved, even when you turn off your phone

• Sudoku and Killer Sudoku both offer five difficulty settings

• Kakuro offers three difficulty settings and three grid sizes

Changes in v1.1:

• Added “Genius” level to Sudoku

• Added KenKen game type

• Added Dutch, French, German & Spanish translations

• Pencil mark improvement – will display the 6th pencil mark value when 6 pencil marks are added to a cell

• More apps

• Best Times table

• Minor bug fixes