I just downloaded Blender, and when I try to open blenderplayer.app it bounces in the dock (I'm on a MacBook Pro using Yosemite) and doesn't open. Can anyone advise me as to what to do? Thanks.
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You don't run blenderplayer.app
by itself like that by default, you would launch this from the command line if you wanted to tweak how the game is run (see the arguments it takes here). It is used to execute games that you exported. To launch the actual application use blender.app
.