The power of the Internet's instant connectivity created from these adventure games an interative world in which the wildest fantasies could be acted out collaboratively. It was a natural step then to allow the participants to begin creating their own adventures (in fact, this had already been tried in the non-networked game market, with limited success). The power of this idea, the MUD (or Multi-User Domain) was the fact that participants could create `personal spaces', which reflected their own personalities and fantasies. A development of MUDs, the MOO (MUD Object-Oriented) made this even easier, with simple programming rules to create interactive objects and spaces.