i always reopen my PS2 for some Mortal Kombat Armageddon (2006) and Twisted Metal 4 (1999). idk if late 90s/mid 2000s count as "retro" but they do take me back
Armageddon was good but as far as Mortal Kombat on PS2, my favorite was Shaolon Monks. amazingly fun couch co-op adventure. I still remember back when I first discovered the game on a ps2 demo disk all the fatalities were censored lol.
Twisted Metal 4, now that is a game I have played hundreds of times throughout the years. A bona fide classic! My brother and I still play that game every once in a while when we are hanging out on the weekends, though sometimes we opt to play Crash Bash instead.