What’s the worst end-game puzzle?

When I say end-game, think of it more as death game, because I’m not talking about the final puzzle (although some of these could fit into that category), I’m talking puzzles that will end the game and force you to do a second chance, usually with a timer or something.

For me, currently, it’s that AWFUL SHADOW THING in the latest game (7 Keys). What the hell! I already hate tunnels with a passion in ND and having to figure a way out of the labyrinth when standing in one spot for more than 2 seconds will have the Lost smoke monster/knight ghost(??) catch you just seems incredibly unfair. It’s why I keep putting off replaying it even though I actually kinda liked the game more than I thought I would.