Algorithms
Tower of Hanoi
Move the stack between three pegs, count your moves and discover the recursive pattern.
Open sectionInteractive challenges
Play Puzzles Online
Try original browser-based puzzles with move counters, hints, keyboard controls and explanations of the underlying ideas.
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Sequential movement
Sliding Fifteen Puzzle
Restore the numbered grid by sliding adjacent tiles into the empty space.
Open sectionMemory
Puzzle Box Sequence Memory
Memorise and repeat a growing sequence of sliding-panel directions.
Open sectionDeduction
Codebreaker
Crack the secret four-digit sequence in ten guesses. The clues reveal correct positions and misplaced digits.
Play now →Spatial logic
Lights Out
Turn off all sixteen lights. Each press changes the selected light and its horizontal or vertical neighbours.
Play now →Number patterns
Pattern Detective
Find the missing term in ten number sequences, from easy stepping rules to more involved patterns.
Play now →Pathfinding
Maze Runner
Navigate a new maze from the starting dot to the star. Use the direction buttons or arrow keys, and request a shortest-path hint.
Play now →The games run entirely in your browser and do not send scores or personal information anywhere.