Act Ends/Points of No Return [Spoilers?]

[Asimazeltov]

I just got to Act 3, and am facing down a familiar video game dilemma (for me at least) which is "I don't know which of the many things I'm supposed to do is The Important One that Moves The Story Forward, and I don't want to accidentally do that one first and end up skipping something."

So if Act 1 ends At the scene where Sif first dies to the trap and Act 2 ends shortly after beating the King for the first time ... Can someone give me an indication of what heralds the end of Act 3 (so I can do it last), as well as info on any points of no return for certain quests? I'm loving this game a lot, but I don't think I'll be able to play it twice, so I don't want to miss anything important.

[brickey.8]

I think that the end of act 3 is talking to the king "one last time" and picking the new option at the "do you remember" prompt, after exhausting all the in-fight dialog, but that doesn't really cut you off from anything except removing some dialog options which you already had to pick to reach that point.

The point of no return that actually matters is the end of act 4, which is talking to the Head Housemaiden after learning everything about wishcraft. That one does cut you off from doing anything else so you'll definitely want to pick a new save slot after doing it. However, the game will explicitly say something like "If you do this your journey will really be over. But maybe you could just keep spending time with your friends instead." and it gives you the option to just do the normal end-of-loop dialog instead. So just be on the lookout for a prompt like that.