Portal 2 has an internal tool that records the movements of your gameplay. To be shown later, like the replay of a racing game. It is easy to use and very useful to show others users the way you solve a puzzle.


HOW TO PLAY A DEMO FILE*

1. Put .DEM file in "...Steam\steamapps\common\portal 2\portal2".
2. Press Shift+F2 to open Demoplayback and open file.
Or in game console put "playdemo NAMEFILE".


HOW TO RECORD A DEMO FILE*

1. In game console put "record NAMEFILE" to start recording.
2. In game console put "stop" to stop recording.
3. The .dem file are saved in "...Steam\steamapps\common\portal 2\portal2"


Important:
*The console must be enabled in game options
*If the map is changed, the .DEM files recorded before the update does not work anymore. Unless the old map is in the cache folder Portal 2.

More info in Valve Demo Recording Tools:



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SAMPLE FILES:

1. Subscribe this map.
2. Download the Demo record files[dl.dropbox.com] for this map.
3. Follow "How to Play a demo file" instructions above.
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Good recordings,
PsychoBR

// Play my Map Pack: Damn Turrets.