ORIGINAL: Freyr Oakenshield
Civil War 2, for example must have matched copies
What do you mean by that - that Steam user is not able to play against a non-Steam user?
EXACTLY ! If your opponent has a Steam sourced copy and you have a Matrix sourced copy, you will have to go to the Slitherine website to obtain a Steam Key and then go to Steam, install Steam (if you are not already using Steam), and use the Key to install a Steam copy of the game to use to play it against your Steam sourced opponent. (Or he will have to buy a Matrix copy from Matrix to play against your Matrix copy.)
On a side note, the Slitherine "Universal Voodoo Site" to merge stuff... is anything but clear and intuitive. I managed to stumble through it... but I'm not really clear about the accounts I saw there or who set them up (I assume it was Matrix that did it when I purchased Civil War 2 from Matrix.) I think the data there was carried over from Matrix's files, but I'm not sure about it. Anyway, I managed to get into Slitherine's website to get a Steam Key, but it was not simple.
I'm not really enthusiastic about all these "universal mergers" (I prefer multiple password and ID barriers between all my accounts) and putting everything in one basket (ala Steam) is a bad idea. I had to do it long ago to play games with friends who were already on Steam and, as in this case, to get the Steam key from Slitherine. It's a security nightmare in the making. One thing you should be aware of is the major hacking issues that have plagued Steam lately with accounts being hacked through internally transmitted messages similar to email scams. They have been adding security steps to thwart it, but it still happens. You just have to be wary of messages from ANYBODY, INCLUDING YOUR "FRIENDS", because they may have been hacked and you must remember to avoid even mouseing over any link you see in a message, unless you are expecting to receive the message you see from the person who sent it WHEN YOU BOTH ARE EXPECTING IT.
< Message edited by GamesaurusRex -- 7/24/2015 12:05:35 AM >