Sitting down before a fresh Sudoku grid and playing Sudoku requires logic ... A jellyfish is when, "Four columns have a ...

While both puzzles engage the mind, they target different cognitive functions. Sudoku requires players to analyze the grid ...

Felgenhauer and Jarvis do this by looking at similarities and relationships between different Sudoku grids that let us quickly count entire families of grids at one time. For example, if we have a ...