The Sundew:
Best-looking game of 2021.
Puzzles are kinda Sierra-hard in places though. You can't get stuck, but the sequence of triggering events is sometimes arbitrary.
After meeting a contact in the restaurant, your character Anna has to go pee.
So you go to the toilets.
But one toilet has a red button, and the other a purple. You can't interact with the red button, it doesn't even give you a description when you click on it. Clicking the purple button of the other toilet tells you it's out of order.
So I assume I have to fix the out of order toilet. But no, none of the items I have with me do anything to it.
... what you have to do is collect necessary items for the post-pee puzzle elsewhere. Only when you have all those items does the currently occupied toilet become available.
There's no hint towards that, other than Anna suggesting she may have left useful items behind in the headquarters.
Nothing hints you towards the occupied toilet stall becoming free once you pick up those items, though.
Oh and one of those items is a flask containing a chemical. It's there from the start of the game, but when you interact with it, Anna only describes you its contents.
It only becomes pickupable after a certain incident in the lab.
Nothing tells you that you can now pick it up. You have to find that out through simple trial and error.
One of the first tasks is preparing a drop off point. You have to hand your rifle, coat, and tranquilizer darts filled with a certain mixture to an officer who will then deliver them to the dropoff.
You find the gun and coat inside your locker, but in order to fill the darts, you need to talk to the bio scientist in the lab.
But she's currently not in.
When does she get in?
...
Her arrival is triggered after you hand your gun and coat over to the officer.
Only then can you prepare the tranquilizer darts.
So if you think "I'll collect all three items and THEN hand them in all together", you're stuck.
I'm still enjoying it for the art and atmosphere, but damn. That puzzle design is arbitrary as fuck.