You followed a path on level 1 and you managed to get here, welcome to "The hub" more known as the portal to levels. You see so much doors on the walls, some are black, coded, normal and non-openable. Someone tells you that you shouldn't open the black ones. The truth of these black doors is that they sent you to dangerous levels. While the coded sends you to the level that has on it decoration, for example if you see a door with some hint of city it will send you to the level 11.