The timestamps below should make it easier to follow the guide. Hit "Read more" for other helpful info. - Before clearing Castle Peak for the first time - Castle Gates 0:16 Upgrade: Bullet Stock +10, Achievement: Castle Explorers (Requires Grenade or TNT) Ceremony Hall 0:45 Upgrade: WP +10 (Requires Umbrella) 1:06 Achievement: Looking Good (Requires Umbrella) Mysterious Cave 2:25 Achievement: Rest in Peace, Me! (Requires Oonusa) Library 4:49 Achievement: Surprisingly Safe Courtyard 3:23 Achievement: A Brief Respite 3:14 Upgrade: Max HP +1 (Umbrella recommended) Clocktower 6:00 Achievement: Quake in Your Boots! - After clearing Castle Peak for the first time - Base & Gymnasium 0:00 Recommended preparations 0:38 Upgrade: WP +10 Mysterious Cave 1:45 Upgrade: Bullet Stock +10 Library 3:50 Upgrade: Defense +1 Clocktower 5:42 Upgrade: Max HP +1 Castle Peak 7:52 Upgrade: Attack +1 (Maya), Achievement: Not Enemies, for now The guide was made from the perspective of someone who had already cleared the Castle Peak area once (also known as the "first round"). Though some secrets can be attained earlier in the game, all tasks are simpler with the equipment available after clearing Castle Peak the first time. Clearing Castle Peak also unlocks equipment upgrading. Defeat bosses during the second round to earn materials for more equipment upgrades. Finally, many of the white gates with the angular symbol on them open up during the second round, allowing greater access to previously unreachable areas of the castle. I've separated the timestamps for secrets that either require endgame equipment or the white gates open from those possible to collect on the first round, but you might do better to just clear Castle Peak once before clearing secrets in each area of the castle. I also tried to rearrange the secrets in a more logical order than they appear in the guide.
