Those Rooms are rooms that contain special Items like Evolution items, TMs and HMs, and many more. You need a Key to open these rooms, which can be bought in the Kecleon Market. You should really try to access those rooms if you can.
**List of Locked Corridor Locations*^:
"Zero Isle North:
Floor 10 :
- Brown Silk
Floor 13:
- Sky SIlk
Floor 16:
- Clear Silk
Floor 19:
- Thunder Veil
- Fire Veil
- Wonder Gummi
- Freeze Veil
Floor 22:
- Shadow Veil
- Eclipse Robe
- Reviver Seed
- Wonder Gummi
- Revive Robe
Floor 26:
- Orange SIlk
Floor 30:
- Green Silk
Floor 35:
- Iron SIlk
Floor 40:
- Six Joy Seeds
Floor 45:
- Friend Bow
Zero Isle East:
Floor 10:
- Joy Seed
- Reviver Seed
Floor 15:
- Hope Robe
- Charity Robe
- Edify Robe
Floor 20:
- Royal Silk
- Reviver Seed
Floor 35:
- Two Reviver Seeds
Zero Isle West:
Floor 9:
- Pink Silk
- Reviver Seed
Floor 13:
- Gold Silk
- Reviver Silk
Floor 17:
- Heart Brooch
- Reviver Seed
- Havoc Robe
- ife Ring
- Eon Veil
Floor 21:
- Gray Silk
- Reviver Seed
Floor 25:
- Reviver Seed
- Nether Veil
- Searing Ring
- Nether Veil
- Terra Ring
Floor 29:
- Purple Silk
Floor 33:
- Black Silk
Floor 37:
- Two Joy Seeds + Two Wonder Gummis
Zero Isle South:
Floor 15:
- Time Shield
- Wish Mantle
- Chrono Veil
- Wonder Gummi
- Wish Mantle
Floor 25:
- Flare Fang
- Bolt Fang
- Aqua Mantle
- Rainbow Veil
Floor 96:
- Miracle Box
- Lake Afar B15F - Blue Silk
- Midnight Forest - B15F - Red Silk
- Shimmer Hill - B15F - Yellow Silk
- Deep Spacial Rift B9F - SkyHigh Veil/Wonder Gummi(?)/Lunar Veil
- Deep Miracle Sea - B3F - Silver Veil
- Concealed Ruins - B29F - Ancient Ring
- Zero Isle North - B10F - Brown Silk
- Zero Isle North - B13F - Sky Silk
- Zero Isle North - B16F - Clear Silk *
- Zero Isle North - B19F - Fire Veil
- Zero Isle North - B22F - Shadow Veil
- Zero Isle North - B26F - Orange Silk *
- Zero Isle North - B30F - Green Silk *
- Zero Isle North - B35F - Iron Silk *
- Zero Isle North - B40F - Joy Seed x6 *
- Zero Isle North - B45F - Friend Bow
- Zero Isle East - B10F - Joy Seed/Reviver Seed
- Zero Isle East - B15F - Edify Robe
- Zero Isle East - B20F - Royal Silk/Reviver Seed
- Zero Isle East - B35F - Joy Seed x2/Reviver Seed x2
- Zero Isle West - B9F - Pink Silk
- Zero Isle West - B13F - Gold Silk
- Zero Isle West - B17F - Heart Brooch
- Zero Isle West - B37F - Wonder Gummi x2, Reviver Seed x2 (found by Larvitarish)
- These are surrounded or blocked off by obstacles such as water. Bring a Mobile Scarf, Drought Orb, Fill-In Orb, Trawl Orb or a pokemon that can traverse the obstacles."
-Mike Y(^_^)Y
