Monkey Knowledge Points

Monkey Knowledge, not to be confused with Monkey Knowledge Packs from Bloons Monkey City, is an upgrade system within Bloons TD6. This menu has upgrade trees for primary towers, military towers, magic towers, support towers, heroes, and powers. Each tree features many upgrades for monkeys that can be unlocked with Knowledge Points. After level 30 some level ups will reward you with 1 Knowledge Point to use here. Some upgrades require a cretain amount of points to be spent in the tree before taken and are lower on their tree. Previous upgrades have to be unlocked to unlock upgrades further down the tree that are more powerful.

Trivia

 * The monkey engineer is the image for the support tower knowledge, even though it doesn't appear as a tower in the game.