At a LAN party 8 of our friends played Versus in L4D2 at the peak of our skill playing those games and the matches were very even and extremely competitive in a good way. I hosted a lot of LAN parties but that was the best of them all. The only game I ever surpassed it with hours played is Dead by Daylight.

The first time my friends and I got Resident Evil Outbreak Files 1 and 2 set up to play online via PCSX2 and the obsrv.org fan server. It's much easier now, but setting it up in the PCSX2 1.6.X days was awful. These games are so much better with voice chat. The only improvement I could dream of is a decompilation adding proximity voice chat. You already hear muffled commotion and gun shots of nearby players. Beat both games eventually on Very Hard difficulty.

The first time I booted up Roller Coaster Tycoon which I got in a cereal box for free. I'm still playing it via OpenRCT2! Parkitect is the true 3D fan sequel, fuck Planet Coaster. RCT3 devs kept making the same mistakes.

Too many to list.