Xanadu

From Code Lyoko WIKI

Xanadu was the original name for Lyoko, and was only named in the pilot Garage Kids. It was a virtual world located at the Factory and accessible by Scanners, like in the real show. It is the obvious spawn for the name XANA. In Japanese, it means "paradise".

Xanadu was much smaller than Lyoko, however, and there were Towers of varying sizes and widths. Also, Aelita was not present here, or at least physically present. Ulrich and Yumi have different outfits in Xanadu, but only Ulrich's is actually seen in Garage Kids.