Alien 3 (Genesis) i want to forget.

But Technocop (Genesis) is even worse, but it is so bad, so bad that is incredibly funny.

Painkiller: Resurrection

One of the worst games ever.

Amnesia: The Dark Descent. I just love that game, but after you beat the main story once, you can't really play it again because you know exactly what's going to happen, so it's not as scary or as thrilling.

Also, the Walking Dead, for almost the same reason (except without the 'scary' part of it)

On a positive note: I want to experience Bioshock and Fallout 3 for the first time again.

On a negative note: Skyrim.

Legend of the Dragoon, so I can play it again.
Graphics don't matter. The battle system alone was really good.

Super Mario RPG for SNES, it would be awesome to play that and be amazed once more.

Now if I was trying to forget how bad a game was I would say CoD

Please I want to forget Final Fantasy XIII-

Runescape, so i wouldn't get sad every time i think about the great memories i had with it and how shit it's become.

I detest Bad Rats with every last fragment of my soul, but if I erased the memory of playing it, chances are I might give it another go, just out of morbid curiosity.

War-freaking-Z.

Serious Sam 2

Modern Warfare 3! :S

Bad rats guys, bad rats.

Elder scroll 4 oblivion... so I can play again, and overwhelmed by it again.

My Entire Life.

Happens to me naturally.

Heavy Rain. But before that put a note on the game disc that say "Don't play this game. Seriously. You'll have more fun sucking on a lemon wrapped in barbed wire."

SECRETS OF THE MAGIC CRYSTAL

Ace Combat: Joint Assault

Had the game before ( Skies of Deception) 100%, ca 12 times played trough on all modes and was so happy that i got the next ace combat

and then i was so unhappy that i wasted my money on it...

Hour of Victory. Made me want to gauge my eyes out.

Flatout 3. I expected so much and it was a let down in every single aspect..

Zelda - Ocarina of Time

So I can play it again!^^

Why would you want to forget awful games? In that case you could make a mistake of trying it again. Whats more, bad and awful games are what we compare good games to, so we can say "game X is nowhere near that piece of cr..."

I would really want to play Fallout 2 with zero knowledge, also Beyond Good and Evil and a couple of Final Fantasies (8,9) =)

Though I definitely wouldn't want to forget a bad game - just to avoid playing it again ;)