John Henry's Lost Hammer was Red-Orange-Purple-Silver on the Steps of Knowledge. The Green Monkeys were also disqualified from the moat. Sorry PP319, you're out. Though if no one else but THK guesses, I'll let you go again. THK is correct with "Pecos Bill's Lost Lariat."
The Steps of Knowledge color combination Red-Blue-Green-Silver occurred in 16 episodes. Name all those episodes.
1. Henry VIII's Great Seal ~ THK
2. The Mussel Shell Armor of Apanuggpak ~ TSM
3. The Jeweled Scabbard of Sforza ~ PP319
4. The Star of the Sultan Saladin ~ THK
5. The Enormous Iron Nose Ring of Babe the Ox ~ PP319
6. The Helmet of Genghis Khan ~ THK
7. The Medal of Sir Edmond Hilary ~ PP319
8. The Belly Button of Buddha ~ THK
9. The Collar of Davy Crockett ~ PP319
10. The Mysterious Manuscript of Mary Shelly ~ THK
11. The War Fan of the Forty-Seven Ronin ~ PP319
12. The Plumed Headdress of Cosa Rara ~ THK
13. Pecos Bill's Lost Lariat ~ THK
14.
15.
16.