Stair Decisions is the ninth Chamber Dungeon unlocked in the game. It one of four of the 'Level 3' Chambers.
The dungeon has four tiles already placed, but there are also two tiles that require staircases. The dungeon has a very open floor plan and while it might take a bunch of tiles to place, there are endless options.
So what. If you put stairs over there, how does that work with the stairs you've got at the start? Maybe if you... But wait, then you'd have to... Ugh. This is why I leave the dungeon arrangin' to you.