PSO. There were many games before and after. Started playing games in the late 80s on NES. My family had already outgrown the Atari by the time I was ready. I still remember finally getting past the 2nd level in Super Mario Bros after 100s of tries and watching my brothers and sisters do it. Close second might be Mortal Kombat for Gamegear. The screen actually had a light built in! Staying up late after bedtime and playing this game in the dark was amazing. Thank you Grandpa for buying it for me, since mom wouldn't let me have it! Then when mom took it away you got it back for me :)