Across
- 2. Pink poodle that Grover befriends
- 4. Serpent-headed monster
- 6. Blonde-haired girl who goes on Percy's quest
- 7. The school that Percy went to for sixth grade
- 8. Teacher who teaches Latin at Yancy Academy
- 11. The god who has turned
- 13. The other monster Percy fights on the Gateway Arch
- 15. One of three gods in the Big Three, king of the underworld
- 17. Mr. Brunner's real name
- 18. Location where the Gateway Arch is
- 21. Ares' daughter, enemy of Percy
- 24. Percy's best friend
- 27. The beach in which Percy has to go to as said by the sea spirit
- 29. The king of the gods
- 30. Mother of Percy
- 31. Percy's mother married this person
- 34. Percy's English teacher
- 35. One of two items stolen, owned by Hades
- 36. Abandoned water park where Percy retrieves Ares' shield
Down
- 1. Swordtrainer for Percy, the actual Lightning Thief
- 3. Name of Percy's sword in Ancient Greek
- 4. The beach Percy and his mother liked to go to
- 5. Main character of the story
- 9. One of two monsters Percy fights on the Gateway Arch
- 10. The deadline in which Percy has to return the master bolt
- 12. The camp Percy goes to over the summer
- 14. Name of Percy's sword in English
- 16. Another word for a half-blood
- 19. A half-man, half-bull monster
- 20. Owns a waterbed shop, Percy defeats in chapter 17
- 22. The trio gets stuck here for five days
- 23. Father of Percy
- 25. The city in which Percy lives in
- 26. One of two items stolen, owned by Zeus
- 28. Nickname for Medusa
- 32. Enterance to the underworld
- 33. The "teacher" Percy fought in New York