Wonderland was the pre-alpha world that consisted of all the worlds, placed on land. Wonderland was the hub
world, as you didn't need to rocket away to travel to a different area, you just had to walk or use a touch-teleporter. Wonderland was scrapped, as it did not fit in with the new story. Crux chunks replaced Wonderland, removing it from the game forever, only to be seen in concept art.