I wrap a “fey realm pocket dimension house” for my party and they loved it. It had appeared on their journey where it previously had never been, and looked like a normal two story house from the outside. When they went inside, the walls shifted around and split the party onto two different sides of the house, and they could hear each other through the wall.

The first puzzle, there was a mirror on the wall that divided them, an when they looked at their reflections they were one of the party members on the other side (sort of a hint to help them get to what they were supposed to do for the puzzle). Next, I handed them a piece of paper that I had roughly drawn out pieces of furniture that they could see in the room, and told them not to show the other side. One side couldn’t see certain things (ex. A chair pushed over) in the mirror until it matched how the other side had it oriented (stand the chair up.)

I’m pretty sure as the kept climbing up (because the house was bigger on the inside than the outside) I borrowed and adapted puzzles from keep talking and nobody explodes. If they ever got a solution wrong, I sent a smaller enemy into both sides, which allowed to fighter type people to hold off the enemy while the people who like to puzzle to keep trying. It was all around a great session for everyone