Speaking about Simon's Quest cryptic moments like throwing holywater at everything just to discover what to do I thought that would be cool to remember another cryptic games. Ok, AVGN told us about Milon's Secret Castle, but i luckily haven't played it.

But I've played another cryptic thing once.
"Dark Angael" made by Vicarious Visions. And damn, Simon's Quest is pretty straight forward compare to this.
It's based on Abuse engine, so it's basically 2D-platformer with free-aim mouse shooting. At the same time it's typical non-linear metroidvania with power relics, Cathedral, Catacombs, some evil monsters looking like aliens etc.))
To say it's hard to understand what to do in this game is say nothing. I spend hours on trying to explore all possible levels and didn't even find anything. Invisible platforms, breakable walls, "ghost" walls, some crazy switches turning on something far far away from themselves, and more.
I tried to beat it a few times in years, but always dropped. Sad, cause it has some dark moody atmosphere and some cryptic charm.