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My Sega Genesis running Sonic the Hedgehog (1991)
(lemmus.org)
Vintage gaming community.
Rules:
If you see these please report them.
Don't use hand sanitizer, at least not the gel type, it will leave a residue. You just need like 91% isopropyl alcohol - stuff you would use to clean a wound.
I've not got any to hand but the cotton bud did help!
Hell yeah. Yeah - 25 years of crud builds up. Those contacts just need a lil cleaning and you are good to go usually. Also if you feel so inclined - swapping out the pin slot in the system itself is very easy and cheap. There's no soldering on the NES, not sure about the Sega.... But honestly if just cleaning the pins on the game did the trick, I wouldn't fuss with it.
Have fun!