Cloud Castle is a D-Mod -trilogy created by SabreTrout and his brother Arik. The first in the series, just simply named "Cloud Castle" was released April 19th in 2002 and was SabreTrout's first ever released D-Mod. February 11th 2007, Arik (the second worker on the D-Mod) updated the D-Mod, fixing several bugs. Cloud Castle has become extremely popular over the years, mostly for it's impressive sequel, Cloud Castle 2: Scarab. The first in the series is a very simple, basic Quest-sized D-Mod, which basically set the story for the rest of the trilogy. SabreTrout has stated that he "wants to improve always from his earlier D-Mods, which makes it really hard to work on Cloud Castle 3".
The following part may contain spoilers!!