I've spent entirely too much time today playing "Blue Prince."
Some of these puzzles are so frickin' subtle.
Example:
Every cell has two paintings in them. These paintings are always the same based on the location of the room, not the room type.
What those paintings represent differs by a single letter. For example, you might find one painting in the room is a grandfather clock and the other is a tie. The clock represents "time" and the tie represents "tie." The letter "M" is the difference. If you take those letters and put them in order left to right, top to bottom, you get something about gates, dates, and chests.
I figured out the message, but not what it goes to.
Example #2:
If you have the magnifying glass and the lights on in the dark room, you can find the solution to one puzzle by looking at the trunk of a tree in a picture, then going to where that tree was cut down and putting that date in as the combination for the lock.
In a different photo, you get a hint that in one room, the red/green clue guarantee is broken.
Example #3:
There are eight pages of sheet music in the game. You have to decipher the clue in two passes.
For pass one, you read the bolded word on each page.
For pass two, you read the first word on each page.
Then you wait for a seed where you have the shovel, go to the forest behind your tent, and find a place in the middle of these white trees to dig up a new room.
I am loving this stuff.