Your nostalgic games - why?

Minecraft is probably a pretty obvious answer, but yeah.

Really any early Mario games from gamecube or earlier. Maybe a few wii games like the first Mario Galaxy, but nothing beats Mario 64.

Also there was an old PC game I used to play with my dad on my giant blue mac with OS 9 installed called Bugdom, I have such fond memories of that game but I never find anyone who remembers or knows of it. If anyone here remembers it I'll be thrilled.