Reference article
Upgrade Well (Level 8)
The level 8 Upgrade Well is the final Well upgrade. All earlier building and upgrade choices remain available.
Upgrading the Well
Collect a 
Magic Droplet, then use the 
Upgrade Well menu to upgrade 7. This upgrade costs 1. The Well’s level is separate from the level of each building you buy.
What it unlocks
This is the highest Well level. It adds no further building-menu choices; you can keep using and upgrading the items available at earlier levels.
Using your Well
Open the building menu to choose an item, check its price and place it in your village. Keep work areas and entrances clear so ducks can build and use it.
