This is one of the cases that is self-explanatory. The game page list them as "Single player", but I remember being able to play with buddies (at least the first one) back in the day. Is available somehow, or is this a "cut-off" version?

The first part has multiplayer mode disabled since it worked under the obsolete Gamespy, but you can enable it by adding this parameter in a shortcut:

"C:\Program Files(x86)\GOG Galaxy\Games\Dungeon Siege\DungeonSiege.exe" zonematch=true

You can even add the parameter directly from the executable provided by GOG Galaxy.

Manage Installation \ Configure \ Custom Executables & Arguments

need to remove spaces either side of = , but that works.

Not sure why GoG haven't set it up as a seperate option since the LAN play should still work (need to test with 2nd machine)

This isn't working for me on win10 at all.
I tried from galaxy and from custom shortcut but multiplayer isn't working.

What about DS3 co-op? The multiplayer option isn't clickable on my machine. Why not gog?

Probably Square Enix's fault. Some companies really don't care to give a fully, working experience on DRM-Free versions.

Its more Devs gave up on supporting LAN , DS3 likely uses Steam.API for its MP support.

GoG really need to supply a drop-in wrapper for their MP Galaxy.api that lets Dev's replace a few lines of code and file and recompile.

It wasn't Gog who removed it; you need to blame Square Enix for that.

Why? Eh; most popular theory, they wanted people to play DS 3 online or they want folks to touch on their other, more newer games. Kinda Like Apple; when you get a broken Apple air or Ipad, they claim it's too expensive and it's better to upgrade to the next best item when the truth is it's about a simple fix and bring it to a repair specialist outside of the Apple bar and get it fixed for about $10 USD or free.

I mean the fellas at GOG are more on game preservation and making sure the older titles simply 'work' on newer machines.

Well, like above, set Zonematch to true in the execution path; you'll boot into the multiplayer menu when it starts... Or if that's annoying, then look up an old CD copy of the game, rip it's executable along with any files that deal with the main menu and dump it into the digital folder along with any CD-Free-hack that removes the piracy check for the game CD.... Which was in a lot of older games.

Wasn't a dig at GoG, it is if it is possible for the MP to work via a command line GoG could have included as an option via Galaxy.

So, what you are saying is, there won't be any multiplayer for DS3 or DS2? Pretty much the whole reason I bought them. I should have done my homework here. Good thing it was on sale. Would love to hear if anyone comes up with a workaround.

It's possible to reactivate the DS2 multiplayer; and for folks who say it was part of an experience we'll never get back; Smack yourselves upside the head.

As this may be the final post here, I'm combining everything at once what to do based on current information.

Dungeon Siege 1:
Click on Game if your running Gog's new Galaxy App;

Go to the setting bar or right click the game from the list -> Manage Installation -> Configure

Scroll Down and CHECK the box that says Custom Executable/Argument

Click Add another executable / argument at the bottom

In Argument, type in:
zonematch = true

Click OK

When you boot back into the game, the VERY first thing you will encounter is the multiplayer menu; ypu can connect via IP from here. You can use Hamachi, Game Ranger, Radmin VPN or any other software available to you to connect to each other through the TCP/IP Connection.

Dungeon Siege 2:

The steps are as follows;
Adding 1 IP address to your windows host file located within:
C:\Windows\System32\drivers\etc

and adding this line at the bottom of the list.

127.0.0.1 dsiege2.available.gamespy.com

Get the NO CD crack, or the 2.2 EXE from the no CD copy world, dump it into the folder and keep the original executable as backup.

You run this, it works and multiplayer is enabled, there is an issue though with trying to activate the use of a mouse.

One of the few reasons I like old games is because when they enable multiplayer, they are the best in the experience they preserve. System Shock 2 is still fun in Co-op and so does the harrowing adventures in Final Fantasy: Crystal Chronicles. They're also a lot cheaper and fans have put their best foot forward to preserve them and add new experiences to them.

I don't need to do that, maybe I didn't explain it well.

All of these solutions will never bring the original experience of connecting to dozens of online games, and it doesn't just happen here.

I was lucky to play various games in their early days, such as Sacred, Diablo, Torchlight, and Dungeon Siege, and while the solutions we have proposed here allow hosting multiplayer games, they will never match the experience of the official servers or the official client.

If you just want to play with a friend, of course, this all works for you, if you want to meet people playing and enjoy the experience and conversations in the game, you are almost 20 years late.

That is why I made the comment above.

Anyway, thanks for unifying all the solutions clearly in the same post.

PS: I don't know how you are going to get DS1 work through Gameranger, that software doesn't allow you to add the .ink and the launcher doesn't allow you to add parameters.

Dungeon Siege- I'm trying to get the online network play to work and I have added the zonematch=true without a problem. I can now click on host games, even start a host game, but the join game option is still greyed out. Tried hosting from both machines. Any ideas?

Four of us are preparing to start the Utraean Peninsula together, so I'd thought I'd share a problem that I haven't seen mentioned, in case it's useful to someone:

I will be hosting the game, and the other three will be joining. One of the players kept getting a message along the lines of "unable to join game". Now, the connection was working, since it was asking him for a password, but right after he would enter it, he'd get the error.

It turned out that the problem was that he was using the Steam version. As soon as he installed the GOG one, he was able to connect.

Also, we're using the MP save mod, along with the Monty Haul one, and the game won't let a player join if he doesn't have the same mods as the host. Thankfully, the error for that was very clear.