On the fifty-sixth level, there is multiple numbers placed on dark brown wood, and flags on light pieces of wood, that are mixed in on a silver door. Above the door, there is a lightning cloud embossed in the wallpaper.
How to beat Floor 56: Starting with number squares on bottom, moving right and up. Set to: 2, 4, 5, 3, 5, 4

100 Floors Walkthrough
Floor 56 Walkthrough
Level 56

100 Floors Cheats

100 Floors Walkthrough – Level 57
100 Floors Walkthrough – Level 55