Puzzle 31

Supported by these lovely people:

Anne-Marie Charrett, Julie Gardiner, Joep Schuurkes, Jim Holmes, Kristine Corbus, Ide Koops, Philip Hoeben, Peter Houghton, Adun Urke, Huib Schoots.

Help me make more and I'll put your name on the list: Use Patreon.


The buttons and lamps obey a simple principle.

Supported by these lovely people

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Prefer to test via an API?