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Puzzles

Circular lights out

A circular version of the Lights Out puzzle. The aim of the game is to turn all of the lights off. When there is an evenly-spaced sequence of bulbs all turned off or all turned on, you may switch them all on or off by clicking two consecutive lights in the sequence.

Lights modular out

A move in the classic Lights Out puzzle could be viewed as addition mod 2. This lets you set up a version of the puzzle where it's addition modulo something else.

Pancake flipping

An interactive toy for the pancake-flipping problem, to go with a post by Katie Steckles on The Aperiodical. By repeatedly flipping the top part of a stack of pancakes, can you sort them by size?