It was ZZT for me, no idea how old I was, probably 8-10 or so.

But when you take a bird's eye view, it's interesting and great to see how over the years, games where you can build your own games remain popular and a common entryway into software development.

But also how Epic went from ZZT via Unreal to Fortnite, with the latter now being another platform (or what Zucc wanted to call a metaverse) for creativity.

Other notable mentions off the top of my head where people can build or invent their own games (in-game, via an external editor or through community support) or go crazy in besides Roblox are Second Life (...I think), LittleBigPlanet, Warcraft/Starcraft (which led to the genre of MOBAs), Geometry Dash, Mario Maker, TES, Source engine games, Minecraft, etc etc.