Similar to the floor transporters throughout the Copy World, you may come across what appears to be another. On the map, this will have a different color from the normal teleporter (yellow for the regular, red for irregular). These floors may have different features to them from normal. I came across quite a few spelunking through the fourth Copy World. Some have been modifier shops (selling Divinigram mods you can't buy from the normal shop), one was a Burst Zone (little crystal spawns that, when you hit them, they fully burst one piece of equipment every time), and another has been just a random item floor. All of these end up giving much different items on the floor than the normal Copy World floors would give so they may be worth diving into for a chance to get some rare and powerful items to utilize back in the Copy World.