Virtual Worlds was released by Domark in 1991 and contains the following games:

VIRTWORA.DSK - Driller (type RUN"DRILLER" to load), Total Eclipse (RUN"ECLIPSE")
VIRTWORB.DSK - Castle Master (RUN"DISC"), Castle Master II: The Crypt
 (RUN"DISC2")

Three of these games were previously available on their own, but Castle Master
II: The Crypt was only available on this compilation and could not be bought on
its own.