Puzzazz has introduced an interesting looking variant of Sudoku, Symdoku Unbound #1 ($2.99), for the Kindle. Rather than numbers or letters (Wordoku Unbound #1 has you use letters from a word in each square). I found Wordoku more difficult in some ways, as it seems to force a different part of your brain to solve the puzzle, so I suspect this one will be more challenging as well. From the pictures, it looks like you use the letters at the left side of the Kindle keyboard to enter the symbols (or the 5-way controller), so you don't have to fight with the SYM key or the number keys.Book Description
Enjoy the challenge of Sudoku? Then this uniquely designed puzzle book is just for you. Symdoku takes the original Sudoku to a whole new level using shapes, instead of numbers.
Fortunately, you don't have to draw the symbols, just match them up with the corresponding keys, and you're on your way. This unbound puzzle collection gives you a great solving experience right on the page. Of course, you can use in-cell notes as you solve, just like you do on paper. If you're stuck, move on to a different puzzle -- you can always turn back to that page later. Or, get a hint and keep going.
You'll be both challenged and delighted with this book of 100 puzzles that fit your personal skill level, because you can change from easy to medium to hard or back at any time. Whatever your skill and solving style, you'll appreciate that each puzzle can be played at three levels of difficulty.
