Revisiting old childhood games as an adult, what are some of yours?

Lately I've been obsessed with revisiting old games and crap that I used to play as a child. What are some that you can remember off the top of your head? Maybe get some nostalgia going.

A lot of the ones I'm thinking about are online games since with the death of Flash, so many of them aren't available anymore. Coolmathgames translated all of it's games from flash thankfully but Neopets, which has been my current timesink, still has so many things on it that aren't available.

Some others I've thought of are Caesar and that Cartoonnetwork Resort game lol.