This is a difficult question to answer properly. There are hundreds of thousands of completely terrible "experimental" games out there. By that, I mean that every developer starts somewhere. The first game someone codes might consist of nothing more than clicking a dot and winning instantly. That does not sound like a very fun game to me, but it is a game nonetheless. (Depending on your definition of a game obvs). Games like Bad Rats, Big Rigs, ET, Daikatana, and other famous "bad games," are not actually that bad when compared to the experimental programming-class games I just mentioned. What separates them, though, is that games created for coding practice are not sold. A better question to ask would be, "What is the worst game you ever paid for?" (Obviously we can allow games that were gifted to you, or that used to be sold but aren't anymore like ET, etc). It seems as if most people are already answering the question as if it were this, though. :p

So this just happened
a game on steam thats called
"Audition online"
Me and my buddies were gonna play it and as soon as we pressed play, our computer completely screwed up and we had to restart. No damage found.

well i have not played it but i have seen it and thats revenge of the sunfish oh god

The Zoo Race its just no...

Roblox. worst game ever -999/0

The Zoo Race!

You Jontron Fans know what I'm talking about.

The Just Dance franchise. It works, and I suppose some people find it fun, but I feel too weird playing the game. Seriously, I can't get past 30 seconds of a song without backing out of it because it is just such an uncanny feeling. Never has a game had a concept that made me feel so weird I couldn't play it. I apologize to the friend who bought it for me as a gift, but yeah I never play it.

The Undead Nightmare DLC pack for Red Dead Redemption.

Red Crucible Firestorm I don't like it because of the graphics and it being very "limited"

FNAF and simcity

Man! i was really scared when i played FNAF
Simcity! come on! "Levels"! not really good, i prefer the sims

Raving Rabbids: Travel in Time.

Not well known, and for a good reason. Imagine Super Mario without the fun and with rabbits. The platforming is either impossible or super easy, and there is no in-between. Meh, I dunno what I expected from a 3DS game .

Probably Bad Rats. It's a game that was made in like 2014 or 2013 and it looks like something made in 2004. Not even. The game plays like garbage and I couldn't even play 30 minutes of that mess. It wasn't even worth the 0.29 cents that it was. I could've bought like, a couple loose Yu-Gi-Oh! cards or something idk

Lego Island 2, FNAF.

Deus Ex: Human Revolution

Hong Kong 97 (read article at your own discretion, may be offensive to some) and Big Rigs. Both of these games happen to be some of the worst of all times. Even ET is better than these 2 broken and offensive pieces of software.

FNAF. Completely overhyped with an annoying fanbase.

Cities in Motion 1/2
Eww

Life.

Well, I've never played this but a game called E.T the extra terrestrial was a game that almost ruined the gaming industry forever.

http://en.wikipedia.org/wiki/E.T._the_Extra-Terrestrial_(video_game)