This exploration roguelike has no combat, and just tasks you with placing rooms on a blueprint – but its Steam Next Fest demo is delightfully devious

The key art for the Blue Prince showing a doorway on a blue wall, which is open to reveal several more rooms within its frame, a person deep within opening another door several layers deep to a bright white light.

I've lived in some strange buildings in my time as a renter, but I have to admit I've never come across anything quite like the mansion Mt. Holly in Blue Prince. A huge building, it's nominally made up of 45 rooms, though when your relative passes away and names you in their will, it's on the condition that you find a 46th room that's rumored to exist. Oh, and also – the mansion changes its layout every single day, and you must begin exploration anew the next morning.

From developer Dogubomb (and published by Raw Fury), this rather generous Steam Next Fest roguelike demo gives me four days to attempt to track down this room. Reader, I fail. I don't even manage to enter the antechamber at the back of the house, which is implied to be the first step towards figuring out the location of that final room. But I do get tantalizing close. I'm tempted to boot up the demo again and start four days from scratch with a fresh save.