Game:

Portal 2 (2011)

Duration: 5:01

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Playing games on Linux:
Portal 2 The Cooperative Testing Initiative

Portal 2 CTI is the mutliplayer mode for Portal 2.
It involves 2 robot built by GlaDos in a testing area where cooperation and coordination is necessary.

The Cooperative Testing is rather short (and mostly easy) anyway it's a huge addition to the game and a really fun gaming experience (just like Trine in multiplayer).Moreover the steam workshop brings in many user created content, extending a little the cooperative lifetime.

http://store.steampowered.com/app/620/

OS : Archlinux rolling release ( http://www.archlinux.org )
Capture : OBS Studio 0.10.1-67 ( https://obsproject.com )
Edition : Kdenlive 15.04.02 ( https://kdenlive.org )