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This does not work for keyboard and mouse :( 

(3 edits)

But the mouse is not inverted.

However if you wish to play with inverted mouse, I believe there's a number of mouse inverter programs out there. I found this one, for example:

EDIT: Sorry to say, I tried it and it only works on the desktop. Guess you'll have to keep googling for a solution. Presumably there's even a global setting for some Unity game config file to invert mouse controls.