The Copper Key Crossword
The Copper Key is a hard English-language crossword with 9 clues. Unlocking the mechanisms of secrecy.
12 × 12 grid. Play free as a guest, with no download.
Opening your interactive crossword…
Across
- 3. Greek letter conventionally used for summation
- 5. Biochemist awarded two chemistry Nobels
- 7. Chinese thinker whose Analects shaped East Asian ethics
- 8. Thinker who wrote the Critique of Pure Reason
- 9. Thinker who analyzed history through class struggle
Down
- 1. Name attached to the sequence 1, 1, 2, 3, 5
- 2. Mathematician called the prince of mathematicians
- 4. South American trade bloc founded in 1991
- 6. Spanish painter of The Third of May 1808
How to play
Select a square, read its clue and enter your answer. Help offers a clue nudge; Check word checks your selected answer. Finish to challenge a friend on this same crossword.