what is the glitchiest game you have played

i would have to say currently sonic and all-stars racing transformed

there is a glitch that happens 1/10 times before the game loads a race track, if you get a certain power-up or item on the chance spinner there is a chance the game will crash it has happened to me a lot of times, now i really regret buying the game and what-ever you, DO NOT BUY THE 3DS OR VITA VERSION the 3ds version is the worst version, i played the demo, it lagged intensly

 

Ah, Pokémon Red. Wonderful times with that game. ^_^

 

Link's Awakening map glitch <3

 

Zork adventure, compilation of all previous Zork games into 1. so many bizzare direction glitches

 

Big Rigs: Over the Road Racing
The AVGN even did a video on it

 

If ROM hacks count, then this takes the cake:
http://youtu.be/vEnXJB47YjA

 

when I was playing Link to the Past on an emulator, it glitched out loads if you held two arrow keys (making you moonwalk) and went through a door in the right direction. Crazy stuff happened ._.

 

Big Rigs, obvs. As far as purpose glitches go, fiddling with Ocarina of Time's cartridge to go out of Kokiri Village early is always fun. And who can forget Goldeneye's "Get Down" glitch? Aaand Pokemon Yellow's secret glitch world.

But my favorite glitchy game is Elder Scrolls IV: Oblivion, of course. It manages to be fun despite being the shittiest game.

 

The glitchiest game that I played >A LOT<... goes to the old online first-person shooter Starsiege Tribes and its user created mods.

I LOVED the glitches of this game. I had a special talent of discovering "things you shouldn't be able to do". Falling through objects, shooting through buildings, regenerating health forever, causing an after-image of myself to appear, sticking my head through the wall, instantly teleporting across the map, tossing out explosive boxes from a vehicles like it was christmas, floating off into space at light-speed, causing the server to start shaking apart, surfing a ship, instead of piloting it, YOU NAME IT I DID IT!

Spoiler

.... you get the idea xD

Despite, how it looks, the game was mostly stable when I wasn't around...

Those were some good times. These glitches weren't easy to figure out, and usually pretty impossible. Like finding a sweet spot in a poorly rendered 3d building object to fall through...

Still, I made a lot of friends, and had a lot of laughs with that game.

 

I would say every game in the Gothic series