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  1. Cooperative Testing Initiative - Portal Wiki

    Jul 1, 2025 · The Cooperative Testing Initiative, or simply co-op, is a multi-player gamemode and campaign in Portal 2 whereby two players can join up and take part in test courses built specifically …

  2. How To Play Portal 2‘s Co-op Mode Online: A Step-by-Step ...

    May 13, 2024 · So whether you missed checking it out the first time around or it‘s been awhile since you and friend embarked on those cooperative science-fueled misadventures, let me walk you through …

  3. Steam Community :: Guide :: Portal 2: Multiplayer Mod ...

    Apr 15, 2021 · This mod allows both you and up to 32 of your friends to play in a single multiplayer match in Portal 2! At this point in time, we are using VScript and a server plugin to add extra …

  4. Portal 2: Co-Op - Full Game Walkthrough - YouTube

    Just a Potato that enjoys FPS games especially Half-Life, Portal and many others! We work hard to produce high quality flawless Walkthroughs and Guides of Mods with NO Deaths!

  5. How to Play Portal 2 Co-op? - ACHIVX

    Mar 18, 2025 · Connecting two controllers for local co-op in Portal 2 was, for a time, a frustrating hurdle. Thankfully, Valve addressed this oversight. The solution lies within the Big Picture mode. Here’s the …

  6. Portal 2: Best Community Co-Op Maps To Try - Game Rant

    Feb 21, 2025 · Looking to get more out of Portal 2 with a friend? Check out these maps made by fellow players.

  7. The Ultimate Guide to Portal 2 Local Couch Co-Op

    Jun 5, 2025 · The co-op campaign brings unique elements such as a ping tool to point out areas of interest to your partner. According to co-op reviews on Steam, 87% of over 20,000 players …