Sudoku is a seemingly simple game of placing numbers in empty spaces on a 9×9 grid – but this straightforward game has led to some rather extreme examples of people going all out to play Sudoku. Some people joke about being “Sudoku addicts,” but it’s true – the game can be so incredibly compelling that some people can’t stop playing Sudoku, even when they know that they really should stop.

See what makes Sudoku and Solitaire so popular. Discover how these timeless games help millions of players relax, stay focused, and give their minds a daily workout.