Sudoku. I have Enjoy Sudoku on my phone, and it was absolutely worth the $3 I paid for it. It has fantastic tutorials for learning solution techniques-- from beginning to advanced. Also recommend The Sudoku Guy on Youtube.
Sudoku. I have Enjoy Sudoku on my phone, and it was absolutely worth the $3 I paid for it. It has fantastic tutorials for learning solution techniques-- from beginning to advanced. Also recommend The Sudoku Guy on Youtube.
For sudoku on Youtube, may I recommend Cracking the Cryptic. Simon and Mark release a couple of videos a day. They solve some absolutely remarkable puzzles, such as this one with only two digits in the grid to start, yet, with the provided rules, it's still solvable.