All of my childhood video games on my Amiga 500 Plus such as Monkey Island, Cannon Fodder, the Goblins saga, The Chaos Engine (damn you bugged ugly Steam version), Gods, Syndicate, Moonstone, Alien Breed, International Karate Plus, Another World, Flashback, Zool, Lemmings, North & South and a ton more.
Ah ah this! Still have my Amiga 500 in a garage: last time I checked it was still working.
Although the one thing that did really blow my mind is the first real-time strategy game I've played vs random strangers over the Internet. Back then for me it was Warcraft II by Blizzard (on PC). Except that the game was NOT meant to be played over the Internet. It was LAN-only.
So we'd install a software simulating a LAN over tcp/ip (it was called Kali, it has its Wikipedia page). Kali was so big that Blizzard did actually release its own customized version of it that it'd then ship with Warcraft II.
And then we'd compete and keep player rankings on "web 1.0" webpages (like Case's Ladder), where basically the system worked based on honor ("I, TacticalCoder, recognize that iMav beat me in a game of Warcraft II on the map "Plains of Snow"). We'd meet on IRC to set up matches.
This was all before battle.net existed of course.
It's this entire experience I'd want to live again: "hacking" LAN-only action games so that we could play them on the Internet, finding strangers on IRC forums and arranging games, playing the game (of course) then reporting the results on these crappy Web 1.0 sites... All this over dial-up of course (not forgetting the sound these modems made when establishing the dial-up connection).
Several of the players and teams who were at the top of Case's Ladder Warcraft II rankings became Starcraft, SC II and Warcraft III players and some made it to pro players.
I'd want to relive this: we knew it was a glimpse into the future.