How To Unlock The Museums 2nd Floor.
To unlock the museum 2nd floor, you need to donate at least one thing in every category (bugs, fish/sea creatures, fossils, art) and 20 things altogether. Silver tools, museum exclusive wallpaper and carpet and glass cases are sold on the 2nd floor and there are display rooms on sale for 10,000 bells each. It then appears on the public works list.
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