Players must begin by choosing Monkey Knowledge from the top of the Monkey Knowledge tree that they prefer. Monkey Knowledge requires players to put Monkey Knowledge points into the upgrades they wish to benefit from. Players can also collet Monkey Knowledge points by completing Achievements.
Players will continue to gain Monkey Knowledge beyond what they need, which comes in handy for expansions and other updates to BTD6. Similarly, players can also purchase the levels up to Rank 30, though I wouldn’t advise doing such as levelling up to Rank 30 is really easy to do. Monkey Knowledge can also be purchased in the cash shop for $0.99 USD. From Rank 30 onwards, players will receive one Knowledge Point for each player level they increase by. Players will only begin collecting Knowledge Points when they acquire Rank 30, making it a short grind before players are able to put their first point in. Players must collect Knowledge Points from levelling up in order to acquire said Monkey Knowledge. Monkey Knowledge is a power-up system that allows players to upgrade or enhance their monkey turrets and powers by their subcategories, being Primary Towers, Military Towers, Magic Towers, Support Towers, Heroes and even Powers. Every version of Bloons TD has different quirks to it, one of the biggest changes in Bloons Tower Defense 6 is the addition of Monkey Knowledge.