Josh's Constant achievement in Bloons TD 6 (Windows)

Not my video but this is one of the bigger BTD6 content creators and he has a good video for this achievement on Dark Castle.

Edit: per HUNTING WARRIOR in the comments this is the most recent updated guide, as of Sep 18, 21. Thanks!

Obviously you will need to beat Dark Castle on Hard, Alternate Bloons Round, and Impoppable to unlock CHIMPS (do not need to do the top row of difficulties like magic only).

I unlocked this achievement using this video in August 2021; future changes and balance updates may make this out of date. If so, let me know and I'll try to find another video.