Not very long ago, the Internet Archive introduced the Internet Arcade, a huge collection of games from the 70s, 80s, and 90s. I spent some time browsing around and found all sorts of classic games that I grew up with playing in the arcade and at home.
The other day, a random web page I was browsing made a reference to Wolfenstein 3D, which made me think of Castle Wolfenstein, a game I spent many hours playing on the Apple ][+ and //e.
I wandered over to the Internet Arcade to see if it was there, and sure enough, there it is: Castle Wolfenstein in all its low res glory, free to play in a DOSBox emulator right there in the browser. The manual for the Apple ][/][+ version is even available on the Internet Archive so you don't have to press random keys trying to remember the controls.
The Arcade is a place to hang out again :)