In the spirit of Minesweeper, Sudoku is another game where the game play and rules are take about 30 seconds to explain. Then you begin trying to solve the puzzle.
The game goes like this: You are given a 9X9 square with 81 boxes. You win when you fill in each box with a single one-digit number (1, 2, 3, 4, 5, 6, 7, 8, or 9) such that each row and column contains no repeats. Also, the 81 squares are divided into 9- 3×3 squares that can’t contain any repeats, either.
That’s it. That’s the whole game. Click here to play a free online version. There are tons of variations as well.
In my opinion, this game flexes the same logic muscles as Minesweeper (see Good Game, Vol. 4) and Armor Logic 2 (see Good Game, Vol. 3). The idea of making-decisions while staying within a small set of parameters is an important step in developing mathematical thinking.