save minecrafts grow cube!

intro:
There was once a peaceful village on a peaceful forest covered cube. one day, something tragic happened. an army of ghasts and blazes came into the village and destroyed everything. there is no plants left, there is a little bit of greenery in a treasure chest, where is all the grass? it needs to be regrown! you are our only hope of regaining out peaceful forest!
Description:
a cube i created that is now what i call the grow cube. because the goal is to get all the greenery back. everything you need for the greenery is in starter chests or hidden chests.
Challenges:
-return all the grass
-get one diamond block.
-find all 3 hidden chests.
-don't fall off the edge
-hollow out the inside of the cube. (hardest one.)
-play hardcore version and don't die.