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Hold down "R" in portal 2 and a menu pops up. What is it?

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Newbie here....I accidentally held down R instead of E in Portal 2 for PC, and a menu popped up.  I can use the mouse to highlight the 4 different options, but i have NO IDEA what they do as i can't select any of them.  I've tried looking it up, but to no avail.  Anyone know wtf it's for?

asked 7 years ago in ControlsControls by anonymous  

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It's the gesture menu, designed for co-op. It seems to be bugged in single player, though. See http://forums.steampowered.com/forums/showthread.php?t=2903935 for how to avoid this problem in the future.
answered 6 years ago by anonymous  

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