The Big Book of Knowledge is an item available in the Store from Bloons Tower Defense Battles. It costs CoinsIcon95.

Description: Unlocks all towers and their tier 4. For those who just want to get on with the business of popping Bloons.

Ad blocker interference detected!

Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers

Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.