Riven: The Sequel to Myst

Hardest puzzle that actually stumped you?

Which Riven puzzle made you resort to a guide or walk away frustrated? What made it click eventually?

The sound design hits different on replays

Notice how much the ambient audio tells you about each Age's state? What's a sound moment that stuck with you?

Catherine vs Atrus: who'd you trust more?

Based on what you learn about them, whose side feels more justified by the end? No spoiler details needed.