Components: 9x9 grid with 9 3x3 sub-grids, digits (1-9) within some grid
Skills required / taught: Logical reasoning
Object: Player completes grid using logical reasoning so that each row, column, and 3x3 sub-grid each contain exactly 1 instance of each digit.

About the Game

Sudoku is a logic-based number-placement puzzle. The objective is to fill a 9×9 grid with digits so that each column, each row, and each of the nine 3×3 sub-grids that compose the grid (also called "boxes", "blocks", "regions", or "sub-squares")
contains all of the digits from 1 to 9. The puzzle setter provides a partially completed grid.

How it Works
Using Logical reasoning skills, such as eliminating possible answers, players figure out which digit belongs in each grid entry.

Thought Bubble
Logical reasoning – In Sudoku players use logical reasoning to place numbers on a grid. How might a player in your game use logical reasoning to achieve a goal? A thief may have to solve a riddle to determine the combination of a safe, a player might need to determine where to strike an object to move it in the correct direction, trail and error tactics might be employed to solve a particular level of an adventure game.