Oh damn I remember getting a bootleg copy of this game for PSX!

Two come to mind. Hardware Rivals which I got for free on PSN ages ago. The other is Mass Effect 3 multiplayer. I think I was in top 100 N7 rank percentile at one point. I’ve never been good at a multiplayer game since.

I miss them too. I would never use a game genie these days, but one of the coolest things I did was with Super Mario Bros. I accidentally put an X instead of a Z at the end of a code that was supposed to make Mario always stay big, but it ended up making Mario always stay small, even with mushrooms or fireballs. My sister and I were elated!