Tic-Tac-Doku™

Tic-Tac-Doku™ brings together the unique logic of Sudoku and Tic-Tac-Toe to create an entirely new challenge that's great for puzzle fans of all types. The rules are simple:

- One Tic-Tac-Toe is allowed per grid section.
- You may never have more than 5 X's or O's in a single grid section.
- You may never have more than three in a row of either symbol in any direction (including diagonally).

While the rules are simple, you will notice the level of challenge increasing greatly as you work your way through the 50 puzzles on the map. There are tips to help you along your way, but for those of you that become an expert, you may find you prefer to disable hints and solve the puzzle without guidance.

Tic-Tac-Doku™ is the brainchild of David L. Hoyt, the most syndicated daily game creator in the world. David is the mind behind a long list of wildly popular games, puzzles and brain-teasers. David’s most famous puzzles include Jumble™, Word Roundup™, Pat Sajak’s Lucky Letters™, Up & Down Words™ and Just 2 Words.™ His games appear in 750 newspapers, including USA Today, New York Daily News, and Chicago Tribune.