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This is a Jade Door/Lock that requires a Jadeite Key....which you make in your foundry....you can check the relevant Wiki pages for locations.
Jade Doors/Locks & Jadeite Locations/Keys
https://wiki.diggysadventure.com/index.php?title=Story_Mines_-_China#Jade_Doors
https://wiki.diggysadventure.com/index.php?title=Foundry
Have you checked out the relevant Wiki pages, quests, maps, videos, guides, walkthroughs and hidden gifts.
In some scenarios, it is much easier to view, study & follow the maps rather than the videos.
You can easily find the solutions to the puzzles if you check out the walkthroughs & maps....everything is highlighted in a clear & concise manner....including the hidden gifts.
These Wiki pages & this forum will become your best friends throughout your Diggys Adventure.
MAP - Library Of War
https://drive.google.com/open?id=1sWkVJlT3hXwMh8Qeqky0vhwmrfzTixPA
VIDEO - Library Of War
https://youtu.be/R_OIB_TCfnA
Mines, Maps & Videos
https://wiki.diggysadventure.com/index.php?title=Story_Mines_-_China
https://www.diggysguide.com/china
https://diggysvideohelp.com/china/
Quests
https://wiki.diggysadventure.com/index.php?title=China_(Quests)
Journals
https://wiki.diggysadventure.com/index.php?title=Story_Mines_-_China#Journal_pages
https://forum.pixelfederation.com/diggysadventure/d/182629-coded-pages-china
Hidden Gifts
https://wiki.diggysadventure.com/index.php?title=Hidden_Gift
