Fill in the empty squares so that the digits 1 through 9 appear just once in every row, column and individual block.

Sudoku features a square puzzle consisting of nine rows and nine columns, which together form nine 3x3 mini-squares within the overall layout.

Sudoku Sunday Classics are identical to the daily version, specifically the Thursday and Friday versions, which are the most challenging.

Sudoku Triples consists of three standard Sudoku panels, sharing one set of 3x3 boxes.

The original hit puzzle from Andrews McMeel Syndication sets the standard for all daily crosswords.

The original hit puzzle from Andrews McMeel Syndication, with a twist: You'll have to solve the puzzle without a grid!

A crossword puzzle with numbers — follow the clues to find the proper sequence of numbers that run vertically and horizontally.

Universal Sudoku is the most popular and widely played Sudoku puzzle in the world. Daily delivery keeps players coming back.