Blue Block Building was an event minigame in Epic Minigames.
The map appears to be taken in a forest.
Players would be assigned to a random house in a forested map where they had to pick up 48 blocks to their house before the time runs out.
This minigame was originally created for the Smurfs: The Lost Village movie event on Roblox. Winning this minigame would reward a player the "Mask of the Lost Village" item from the Roblox Catalog.