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no proof but do it yourself sorry if posted b4 never seen it
1 go to split screen zombiez with friend
2 have one person charging controler
3 the person thats not charging press start and go to brightness when that persons changing the brightness the other unplugs the controler
4 when its done finding the controller the one who unpluged it presses circul/ b to get out of start
5 when you get out only one person will have a screen not two