I can guarantee you that Chiller is 2-zapper compatible, Jim. Me and wiz beat the game last year playing simultaneously with two zappers. The question is, would it be possible for one guy to independently aim and control both guns by himself...
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My mantra, as worded by SamSpade on 06/12/12:
I don't resell to fund my collection, I don't treat this hobby like a second job, I don't care if my collection is worth ten bucks or ten thousand because I never plan on selling it. Seriously, what does the value have to do with anything if you never plan on selling? Speculation doesn't mean jack shit to me at this point, I just want to play my nes games...