0 a number game in which you have to write a number between 1 and 9 in each small box of a 9x9 square -- 數獨遊戲（一種數字遊戲）
Hundreds of original trivia quizzes are available along with syndicated games that include vocabulary hangman game, interactive crossword, sudoku, kakuro, chess puzzles and cryptograms.
Mffert also created his own version of sudoku, the popular nine-number print puzzle.
Sudoku involves a 9x9 grid with numbers in every square.
For example, a wave might include a sudoku gadget that lets the wave participants compete to see who can solve the puzzle first.
Puzzle books may contain puzzles all of simply one type like (e.g. crosswords or sudoku) or a mixture of different puzzle types.
Among the population of all sudoku grids, those that are automorphic are rare.
Sudoku puzzles can be tiled with square polyominoes.
Retaining a clear mind into his 90s, he enjoyed tackling sudoku puzzles.
