Steam was the first major player but now you can find a vast amount of different services. Which one should you use? Where do I get the best prices? And most importantly, the best coop games?

Steam

The one and only. We have all heard about it. Used it, loved it, hated it. Not the cheapest but the vastest library of games.

• Left 4 Dead 2
• Portal 2
• Crusader Kings III
• Total War: WARHAMMER

EA app

EA launched its Steam contester Origin long ago and has since replaced it with the EA app. Even though EA isn't the most popular gaming company if you ask the gamers, its games are among the most loved ones. And even though they only sell EA games, the EA app is a good service for the PC.

• Unravel Two