Across
- 3. Centaur trainer of heroes at Camp Half-Blood
- 5. Half-man, half-goat
- 7. Multi-headed serpentine monster
- 8. Ruler of the Underworld
- 9. Percy Jacksons's parent
- 10. God of war
- 13. Home of the Greek gods
- 15. Realm of the dead
- 17. Mythical beast first encountered by Percy
- 18. King of the gods
Down
- 1. Loyal friend and daughter of Athena
- 2. Protector and satyr companion
- 4. Messenger god
- 6. Goddess of wisdom
- 7. Giant ice monsters
- 11. Dangerous casino that traps demigods
- 12. Vampiric female demons
- 14. Hybrid monster with lion, goat, and serpent parts
- 16. Three-headed guard dog of the Underworld
- 17. Demon with snakes for hair