Starting life as one of the very first 24-Hour RPGs, the original vs. Monsters was created over a wild 24-hour period. Since that time the system has grown, expanding into a commercial version of vs. Monsters and then into an OGL system that any fan or publisher can use to create their own games.
To use the vsM Engine you will need either the SRD or a vsM Engine game and a deck of playing cards.
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