SuperDoku is a version of SuDoku for the Pocket PC that uses a graphical interface instead of just numbers in squares. This means you can play using colored gems, Egyptian symbols, Hebrew letters, Signs of the Zodiac, or pretty much any thing else (including, of course, numbers in squares).

If you don't know how to play, you can find instructions here and some pretty cool strategies here.

Features:

• 8 different difficulty levels.
  It does not just load grids from files. It randomly generates them each time so you'll never run out!
• Beat lower difficulty levels to earn higher difficulty levels.
  Or email the author if you want a cheat code.
• Solves entered-in puzzles.
  Using the "Burn Grid as New Game" tool.
• Load and Save functions.
  You can save up to 5 SuDokus to work on later. Comes with auto-save options.
• Pencil Marks.
  Little numbers in the corners of the squares that some people like to use to remind them of what can go where.
• Crayon Marks.
  You can draw notes right onto the screen in 4 different colors, and 3 different thicknesses. As far as I know, SuperDoku is the only program that lets you do this.
• Hints.
  Two kinds, spoiler and non-spoiler. It can show you the location of a square that can be narrowed down to one option, or it can fill in the square for you. If you use hints, though, you won't earn higher difficulty levels.
• Reveal Mistakes.
  Lets you know if you're on the right track by blinking incorrect squares. If any mistakes are revealed, you won't earn higher difficulty levels. You are not penalized if no mistakes are revealed.
• Bold Selected.
  This makes it really easy to focus on a certain number by "bolding" every square already containing that number. If you've ever done a paper SuDoku, you've found yourself wishing they had this option.
• Bold Original Game.
  Makes it easy to see which squares you can edit and which you can not.
• Skinnable Interface.
  The game comes with a few nice skins, and I'll upload new ones here periodically. Also, it's really easy to make your own skins and send them in so other people can download them.
• And the #1 Feature: IT'S COMPLETELY FREE!
  Of course, donations are always gladly accepted!

Update Description:
v1.1:
- Contains numerous fixes. Most notably, the error with the pencil/eraser/crayon icons not showing up is finally fixed!
- You are no longer penalized for using Reveal Mistakes if no mistakes are revealed.
- A new skin has been added to this version.