Set Monkey Money, Knowledge Points, and Trophies to maximum.
Rapidly level up towers to unlock Tier 5 upgrades and Paragons. Understanding the "Hotfix" (v3.0.4a) Bloon's TD 6 Trainer v3.0.4a (Hitfix).zip
Toggle Infinite Lives, Infinite Health, and Instant Ability Cooldowns. Set Monkey Money, Knowledge Points, and Trophies to maximum
Unzip the folder to a dedicated directory (not the game folder). Set Monkey Money
Only download from reputable sources. Zip files like "Trainer v3.0.4a (Hitfix).zip" are often used as containers for "Hitfix" (likely a typo for Hotfix) which can sometimes mask malicious executables.