Brain Teasers
- 81
- Sudoku Online
- Includes Sudoku tips and strategies as well as a downloadable game and a 3D Sudoku puzzle.
- 85
- Sudoku Puzzles
- Offers four difficulty levels. The puzzles can be solved online or downloaded as a PDF file. [English/German/French/Spanish/Dutch/Portuguese/Italian]
- 86
- Sudoku Puzzles
- Free daily puzzles with five difficulty levels with their solutions. Also offers guide to solve Sudoku puzzles.
- 87
- Sudoku Scratch Pad and Daily Sudoku
- A scratch pad to help you fill in a Sudoku puzzle. You still have to solve it yourself. Every day, you get three fresh Sudokus.
- 89
- Sudoku XL
- 4 levels of online playable Sudoku. Print up to 6 sudokus on one A4 sheet. Requires Flash.
- 90
- Sudoku enumeration
- Several programs in different languages for analyzing possible Sudoku combinations.
- 91
- Vegard Hanssen's page
- Offers a database of crafted puzzles, organized by difficulty. Also offers FAQ and forum. [Norwegian/English]
- 92
- Wikipedia: Sudoku
- An encyclopedia entry describing the rules, history, strategies and variants of Sudoku. Notes that these are a type of "Latin square" which have been analyzed since ancient times.
- 93
- World Sudoku Championship
- Information on the 2006 World Sudoku Championship held in Italy. Includes background information, events, results and FAQ. [English, Italian]
- 95
- online Sudoku puzzles
- Single daily Sudoku puzzle, 5 different levels (easy to very difficult), playable online (Flash required) and printable to PDF.