I'll always rep Game Masters in the North Hills. Phil has probably the most diversified board/card game shop in the area, while everyone else has more of a niche into card/board/wargaming. Bias warning, I've solicited this shop with my business for half my life and I run the MTG scene there for him as a volunteer, Weds night is Commander and Friday nights are Booster drafts.

Games Unlimited in Squirrel Hill is another favorite, Kylie is legit one of the best people in the scene here in PGH.

If you like wargaming, Griffon's lair from Erie has opened a location on Babcock in the North Hills.

Very popular but I haven't been personally would be Taitan Games/Fabricators Forge in Coraopolis.

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It really depends on where you are.