ANSWER:

If you know for sure that they will play haram games on it then you should not sell it to them. However, if you don’t know then no problem in selling as it can be used in good and it can be used in bad like a knife. 

If i sell My gaming system and someone buys it and plays games with haram content on it, Will i get punished for it?

Sports, Entertainment and Music | March 10, 2019 5:20 pm
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I was wondering if having a soft melodious (not string) music in the back of advertisement videos is Haram or not. For example, at the start or end of a TV show, and then ads on TVs. Are they haram, because if there is no tune then the ad is completely soundless. If it is haram is there a solution to this? I make marketing ads and therefore require to put soft music in the back