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The wall that saves light
Level 2 · Medium
A shopkeeper completely covers a window from the inside. The next day, with the same sunlight and activity, he can turn off a lamp he previously kept on. The new covering emits no light.
- Choose a narrator: they read the answer privately and hide it.
- Read the premise aloud. Answers: yes, no or irrelevant.
- When the game ends, mark the puzzle as played.
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