
The whole saga is detailed in this fan wiki, and it’s worth reading to remind yourself (or educate yourself) of how creative Valve were with it. Valve went as far as to change the ending of the original game, adding a small sequence that suggested the escaped Chell was being dragged back into the facility for further testing. They didn’t make it easy, but the payoff was the eventual announcement of the sequel.
PORTAL 2 CO OP CODE
The morse code led to a Portal-themed bulletin board that had to be accessed via a phone line and a 56k modem.

PORTAL 2 CO OP INSTALL
It was the sound files, found in Portal’s install folder and viewed through “slow-scan television software”, that contained scrambled Portal 2 imagery or even more morse code. They added 26 radios into the game that, when moved around, re-tuned to play a piece of morse code or a squelchy transmission sound. That one’s dead, after Valve updated it to announce the sequel. The first one is the self-contained story that Valve released on 10 October 2007. There are two versions of the original Portal. Portal 2 was announced inside Portal To see this content please enable targeting cookies. Chell was welcomed back to Aperture Science. Portal 2 was to star someone called “Mel”, but when the playtesters met GLaDOS again in the sequel and she didn’t know who Mel was, they felt like the game was missing the shared experience that the first game had built up.
PORTAL 2 CO OP SERIES
Valve swiftly added portals back into the game series called Portal, though they resisted adding Chell back as she wasn’t much of a character and had already escaped. He said: “It was a lot of things, but it wasn’t Portal 2.” Though some elements of that version of Portal 2 still exist, with GLaDOS’ replacement Cave Johnson appearing heavily in the final game, writer Chet Faliszek pointed out at GDC 2012 that this wasn’t what people wanted in a sequel. To see this content please enable targeting cookies. The game was initially going to be set in the mid-’80s and based around a mechanic called “F-Stop”, which involved using a camera to grab sections of the game’s scenery to solve puzzles. Valve’s initial experiments into a Portal follow-up jettisoned everything but Aperture Science. Portal 2 originally didn’t have any Portals in it 10 is a nice age to celebrate, and it’s also the perfect number of random facts to pluck from the history of one of Valve’s most celebrated games.

I’d like to think that the ultimate goal of Portal 2 was to get me to write an article about its tenth anniversary, so my ego wouldn’t let it go by. You can run them in sequence by entering the game via 'mp_coop_start' or you can load each one individually and start play from that point.Ten years ago, Valve released Portal 2. There are forty-two 'Portal 2' maps that can be played. At this point both players will enter the map simultaneously and begin playing. While the other player is prepping, the host will launch the CO-OP map by placing this code in the console: map map mp_coop_start. If you don't connect right away don't worry: It'll continue to attempt a connection every few seconds. The example IP 11.11.111.11 must be replaced with the actual IP address. That player will then paste the code connect 11.11.111.11 into the console. The player hosting the game will need to provide the VPN temporary IP address to the other player.

PORTAL 2 CO OP HOW TO
If you are unfamiliar with this type of software then I suggest reading my article General assembly: ArmA 2 VPN Setup which explains in detail how to connect with your friends on Tunngle.

You can use Tunngle, Hamachi, Evolve or any other LAN-like network of your choosing. Both players now need to login to their mutual VPN.
