The Blue egg is a type of block in Build a Boat for Treasure. This egg is available during the 2018 Easter update. You can find this egg in the trees of any colored base. To obtain this egg you can either jump from a tall tower or simply just build a tower and have it fall on the tree. It represents the sky and the ocean. This egg can prove a challenge for many players trying to reach it.
There is no limit to the amount of blue eggs you can collect.
Click here for the full list of blocks.
It hatches into Ice.