size it up.

A little perspective

Weight

Add or remove either object to balance the pans. You have five weighings; only your best score counts. Exact balance earns 100 points and finishes the challenge. Empty pans cannot score. A new pair arrives at 00:00 UTC.

Read the full rules and scoring guideLet’s play

Weight

Weight archive

Another chance to test your intuition.

Replay past challenges as often as you like. Challenges and answers appear here after the UTC day ends at 00:00 UTC. Practice scores do not count toward any leaderboard or today’s progress.

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Past challenges

  1. 1 challenge · practice & answers
  2. 1 challenge · practice & answers
  3. 1 challenge · practice & answers
  4. 1 challenge · practice & answers
  5. 1 challenge · practice & answers
  6. 1 challenge · practice & answers
  7. 1 challenge · practice & answers
  8. 1 challenge · practice & answers
  9. 1 challenge · practice & answers
  10. 1 challenge · practice & answers
  11. 1 challenge · practice & answers
  12. 1 challenge · practice & answers