There's a multiplayer mod for The Witcher 3 so you can turn one of the finest singleplayer RPGs of all time into an MMO instead

A modder called rejuvenate, previously responsible for the Wolven Trainer (which bundles together freecam, a time-of-day ...
Adventure Gamers

The Witcher 3 just became a co-op RPG, thanks to this mod

You can now play The Witcher 3 co-op thanks to a new mod. Here's the lowdown on Witcher Online and how to get it for yourself.

You can play The Witcher 3 in multiplayer now

"The focus of this mod is to allow you to see other players on their adventure exploring throughout the world," rejuvenate ...

You can now play Witcher 3's entire campaign in multiplayer, which is a perfect excuse to return to The Continent with pals

As if one Geralt wasn't enough, this Witcher 3 mod allows you and your friends to play as monster hunters together.