Across
- 2. Visit to Fort Sumter, encounter with the twin giants Ephialtes and Otis.
- 4. Visit to Boreas, the god of the north wind, for advice.
- 6. Nico, Jason, and Hazel meet Cupid (Eros), where Nico’s feelings for Percy are revealed.
- 10. Wolf House. Final battle against Enceladus, a giant.
- 13. Hazel and the rest of the crew journey to close the Doors of Death from the outside.
- 14. Percy fights the Gorgons and discovers Camp Jupiter.
- 15. Retrieve Thanatos (Death) from the clutches of the giant Alcyoneus.
- 18. Visit to Apollo and Artemis for guidance.
- 22. Camp Half-Blood
- 23. Camp Jupiter
- 24. Search for the physician’s cure to aid in their final battle.
Down
- 1. Encounter with the katobleps and aid from the god Triptolemus.
- 3. Annabeth retrieves the Mark of Athena and faces Arachne.
- 5. Encounter with two dwarves, Akmon and Passalos.
- 7. Percy fights the hydra.
- 8. Confrontation with Gaia and the giants.
- 9. Percy fights a Nemean lion at the Smithsonian.
- 10. Stop at the Amazon headquarters where they encounter Hylla and the Amazons.
- 11. Final gathering of demigods before the battle.
- 12. Stop at the Lotus Casino, where they lose track of time.
- 16. Encounter with King Midas, who turns Leo and Piper to gold.
- 17. Percy, Thalia, and Annabeth rescue Bianca and Nico di Angelo.
- 19. Leo, Frank, and Hazel encounter the god Narcissus and the cursed Echo.
- 20. Fight with the Cyclopes and the discovery of Leo's mechanical dragon, Festus.
- 21. Meet Phorcys and Keto, sea deities, in an aquarium.