Conceptis offers a variety of logical challenges at its website available to anyone. Eleven different puzzles await the intrepid solver, including familiar puzzles like Sudoku, Picross (here called "Pic-a-Pix"), Kakuro, Slitherlink, and a variety of puzzles that might even be new to logic puzzle lovers.

Sudoku Craving is a great resource for sudoku addicts looking for their daily logic fix. The interface is clean and elegant and, in addition to keeping track of your personal performance on each puzzle, comment boards and high score charts encourage community participation and competition.

Sudoku Combat is a browser-based multiplayer version of the popular puzzle game that offers a new experience for those that prefer a more competitive challenge. Just enter a user name, select a puzzle difficulty, and then choose to play against a friend or a random stranger. Then it's a race to the finish.

Sudoku is a popular puzzle game that began in Japan and has subsequently spread like a wild fire throughout the rest of the world. Similar in form to a crossword puzzle, the game is played using numbers only. There is no math involved, just the correct placement of the digits into every row, every column, and 3x3 square. Web Sudoku provides your daily puzzle fix conveniently over the Web.