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Triangle of Insanity is an expert track in Bloons Tower Defense 4 Expansion. This track is considerably hard as the Bloons only move around the outside, and that makes the track extremely short. It has three entrances and exits. If this track is completed on Medium or Hard, the supernatural speciality will be unlocked.
- This is one of the two tracks that appear in space, the other being Space Truckin'.
- This track is based off the Penrose Triangle.
- It is the only track that is an Optical Illusion.
- This track is among the hardest of Bloons TD 4 tracks due to its short and confusing paths, with the other candidates possibly being Monkeys vs. Bloons, Down The Drain, Bloontonium Lab, Crypt Keeper (with Reverse Mode turned off) and Tar Pits.