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Ah, this hasn't worked for me, so it must be bugged. I'll try again and redownload if it doesn't work, thanks for the hasty reply ^^
I don't understand how to actually bust open the gravity gun box. I first did it by having it in an infinite loop and it eventually just hit the ground really hard or something, but I can't do that now I went back on the save. How are you supposed to open it?