It's not hard. You just need to have a bit more awareness than the average dungeon, but it's basically no different than the Shiva ice drops\Tsukuyomi's Zashiki Asobi.

I'm colourblind. Mt Gulg was hell, P3S is even worse. Prance isn't that bad. The colours may blend if you have a different sort of colourblindness, but it's got a glowy effect that makes it noticeable enough. P3S is just daft, there's no comparison.