Math Insight

Graph coloring and Sudoku are equivalent problems. Each cell is a node; edges connect cells that share a house. Solving Sudoku = coloring the graph with 9 colors.

Math Insight

Medium Sudoku Puzzles

A step up from easy. Requires basic elimination techniques.

Showing #201–#300 · Page 3 of 10

Food for Thought

"It is during our darkest moments that we must focus to see the light." — Aristotle

Food for Thought