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 sectionThe games run entirely in your browser and do not send scores or personal information anywhere.