Playground

A real edge-matching puzzle, sized for humans (3×3 to 5×5). Beat the clock, then find out how many times a computer could have solved it while you played.

A real backtracking search, live in your browser. See it place pieces, get stuck and undo. From 1 step per second up to millions.

Draw the order the solver explores the board (spiral? zigzag? chaos?) and race your idea against the classic strategies.

Make real puzzles for the table: pick sizes and colors, print double-sided with piece numbers on the back, cut along the lines.