Chrono Trigger Walkthrough

1. Lost Sanctum

Enemies:	None
Treasures:	See Below

The first of the two bonus dungeons is made available to you as soon as the Black Omen rises from the Ocean. Ideally, doing all the other available sidequests (check out the links below) will give you higher levels, the (currently) best weapons for each character, making the dungeons easier to progress through. Additionally, I'd strongly advise going around the Middle Ages and the Present picking up the items in the Sealed Chests — specifically the various coloured vests and plates. They'll help a great deal against some of the elemental bosses you'll face.

Right. So, you're prepared and ready to take on the Lost Sanctum. No extreme levels are required — a well balanced and equipped party of level 40 will be able to tackle this dungeon without a problem. The two entrances to the Lost Sanctum are in the Middle Ages and Prehistory. However, trying to go to the Middle Ages portal to begin with will result in your party complaining that there are too many enemies, so that leaves you with Prehistory.

Chapters
1. The Millennial Fair	2. The Queen Returns	3. The Queen is Gone	4. We're Back!
5. Beyond the Ruins	6. The Factory Ruins	7. The End of Time	8. The Village of Magic
9. The Hero Appears	10. Tata and the Frog	11. The Rare Red Rock	12. Footsteps! Follow!
13. The Masamune!	14. Magus' Castle	15. Forward to the Past	16. Unnatural Selection?
17. The Magic Kingdom	18. Break the Seal!	19. The Guru on Mt. Woe	20. What Lies Beyond?
21. Lavos Beckons	22. The New King	23. The Time Egg	24. The Fated Hour
25. The Moon Stone	26. Ozzie's Fort	27. Cyrus and the Masamune	28. The Rainbow Shell
29. King Guardia's Trial	30. Fiona and the Sunken Desert	31. The Genocide Dome	32. Preparing for Lavos
33. The Black Omen	34. The Final Battle (Part 1)	35. The Final Battle (Part 2)

Chrono Trigger NDS Supplement
1. Lost Sanctum	2. Purge the Forest!	3. The Golden Hammertime	4. Crono and the Amazing Technicolor Stone
5. Learn to Hate Emerald Mountain	6. Building a Bridge	7. Under Siege	8. Our Heavenly Idols
9. Dimensional Vortex	10. Antiquity Abuse	11. Gifts in the Present	12. The Future is for Burning
13. Devouring Time