This has probably been suggested before, but I think that a category should be created for completing CHIMPS with only two towers in the fastest time. I'm sure some of the community are aware of this being both a well-tracked challenge and also an achievement in-game.

It could be separated by map, or difficulty, or just kept in one category. I think this is a good idea because it changes playing technique drastically - it is very unlikely that you will be able to simply place both towers near the start and still succeed, so it brings a new skill to the game - placing towers accurately and making sure, especially in the earlygame, that bloons do not leak through a large portion of the map by having careful ability timing or changing targeting.

Anyway, I'd love to hear what you guys think of this idea and I hope it gets added soon!

~SummerPi