Can you solve the locker riddle? - Lisa Winer
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If you enjoyed the locker problem, you might enjoy studying figurate numbers. Another fun problem to investigate is the handshake problem. An interesting extension is to write square numbers as the sum of odds. Visit the educator's blog that links these units together, and another that is from the viewpoint of students who learned about it.
Love riddles? TED-Ed has plenty of them that will challenge you:
The famously difficult green-eyed logic puzzle - Alex Gendler
Can you solve the prisoner hat riddle? - Alex Gendler
Can you solve "Einstein’s Riddle"? - Dan Van der Vieren
Can you solve the temple riddle? - Dennis E. Shasha
Can you solve the frog riddle? - Derek Abbott
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