Expanded Research

Expanded Research is a upgrade to Research in Bloons Tower Defense 8.

How To Unlock
Unlock the King of Research achievement. Have 10,000 Monkey Money and 10,000 Gold

Then go to research and it says: "Unlock Research Expansion for 10,00 gold and monkey money."

Say yes to that question and you unlock Expanded Research.

What It Does
It unlocks many more research for you (Expanded Research boxes when you have not got the secret are black).