Lots, though I'm not sure if I remember them all. For one, I always regretted when I sold my copy of Crystalis. I didn't find it again for years. One time I found it again in another town, but didn't have any money, and my parents wouldn't let me borrow any from my sister to get it. I also regretted selling Dragon Warrior, Legacy of the Wizard, Blaster Master... most of the games for the NES that we sold when we needed money to get the SNES. Seems like there might've been ones for later generations that I regretted, but I don't remember what those would've been. Anyhoo...

Wuv, Yer Mom