There are quite a few games I regret selling. Namely, pretty much all my GBA games. I had Wario Land 4, Yoshi's Island, Mario Bros 3, Super Mario Advance, DK Country... I even had the original Bionicle and Matoran Adventures.

I also regret selling off my Klonoa and Okami for Wii. I didn't get far on either but I decided I didn't like them anymore, so I sold them.

How about you guys?

Back then I sold the Wind Waker, only to buy it some time later...kinda, doesn't matter now though. lol

Well the only game right now that I regret selling is my copy of Mega Man X collection. I didnt realize how hard it would be to get now but at the time I needed the money.

Also not a game but I regret selling my original model PS2. Again I had to sell it cause my roommate lost his job and we needed the rent money. Since than I have been trough 4 slim model PS2s. And unless I can find another original model PS2 I wont get another PS2.

Oops, I misread the title.

Games I regret selling:

Quest 64
and
Original Xbox w/ Knights of the Old Republic. I would do almost anything to have that game back. I don't have a PC so I can't just download it.

Metroid Prime Trilogy and Super Mario Galaxy 2.

I had a limited edition Pokemon Leaf Green GBA SP which my dad bought from the Pokemon Center store in New York (now Nintendo World). I didn't take good care of it at all and the screen broke, so my dad sold it for about £50 on eBay. If I had it now, I could easily fix it, and potentially sell it for a lot more...

And Dragon Ball Z Budokai Tenkaichi 3 which was one of the games that got traded in for my 3DS, I got extremely ripped off for that by GAME. Actually, just any game I traded into GAME because their trade in prices are just extortionate.

I... I don't specifically mean this to troll or anything, honest, but I actually never got into the habit of reselling my games until I bought third-party games on the Wii U.

With all of my family's travels, I have lost — and found — many games I owned, but we never resold any of them. The thought of reselling our games never really came to mind since we thought that a decade later we could still be playing them: that's how good are the memories they brought to us. That's why we still have my Gamecube and N64 games (Baten Kaitos I & II, Fire Emblem Path of Radiance, Wave Race...), and both consoles too (though they're not with me).

My N64 collection including: Banjo Kazooie, Banjo Tooie, Diddy Kong Racing, Perfect Dark, Paper Mario, Star Fox, all for like $80 at bookmans.
"Hey I owned these game for 8 years, I think I'm thourghly satisfied and will never EVER want to play them again." - Me
To rebuy all my favourites is about $400-$500. I was such a fool.

Spiderman Shattered Dimensions, it was bought by a family member who never buys me video games, and for some reason I can't remember, I sold it.

My brother and I sold all our NES, SNES and Game Boy games back in the day. How was I to know that I'd become a collector later on in life?! So annoyed... As he is the older one I'll blame him.

Off the top of my head?

Viewtiful Joe
Prince of Persia: The Sands of Time
Pokemon LeafGreen
Pokemon TGC
Advance Wars
Super Dodgeball Advance
Sly Cooper and the Thievius Raccoonus
Sonic Advance 1 & 2
My entire NES, Genesis and N64 collections

pokemon white, animal crossing city folk.

Surprisingly nothing. I rebought everything I cared about that I ever sold at decent prices.

Gameboy. Halo 3. Mario Kart 3DS. DSi Pink. Hmmm thats all I can think of for now..

Paper Mario and The Thousand Year Door.

As a 6 year old kid, I didn't understand the game and got stuck in the first 20 minutes. Didn't even make it to Hooktail. So I sold the game out of frustration. a decade later, I realized my sheer stupidity and bought a used copy from Game Stop however, I don't have the original box art which really sucks; just that generic box Game Stop uses for used games.

I never sell games (unless they are duplicates i picked up in a job lot) so i have no regrets at all.

Hercules for n64. I hated the game. It was flawed in so many areas and was frustrating and boring. However, I wish I'd kept it because it was boxed with instructions and would have been worth more now.

@Mk_ll how do you never sell games? I'm at gamestop atleast once a month.

Mario Kart Double Dash. I had so much fun with it, I don't know what compelled me to get rid of it..

Pretty much most of my gamecube games back in 2006. I sold Spongebob: Battle for Bikini Bottom, Pokemon Colleseum, XD Gale of Darkness, Mario Party DS, and Final Fantasy on the PSP