The Candle Problem is an old logic puzzle, originally published by Karl Duncker in 1945. It might seem straightforward, but to solve it correctly, you’ll need to be able to think outside the box.

The Candle Problem

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You’re in a room with a table pushed against the wall. On it is a box of thumbtacks, matches, and a candle. You must attach the lit candle to the wall in a way that the wax won’t drip onto the table or floor. How do you complete this task?

Continue reading when you’re ready to check your answer (or you’ve given up!).