To NameFound64: The empty space actually sends me to Shield-Owl world, also known as the most disappointing new portal of the nexus (I've always been annoyed with Garden World too).
To TamayoMeri: Actually Theater World was my favorite portal to warp to. The spelling room was an easy shortcut to the Binary World via the Warehouse, the little spot accessible via the ladder containing eyeball men also led to a nice sepia-colored world (I was super-intrigued with the convenience shop there). When it comes to underexploited portals or worlds, there is much worse.