What candy bar failed?

It's impossible to say definitively which candy bar "failed" without knowing the specific criteria for failure.

However, here are a few candy bars that didn't perform well in the market and were discontinued:

* 100 Grand: Though still technically available, it's not as popular as it once was.

* The "Snickers" White Chocolate Bar: It was discontinued due to poor sales.

* The "M&M's" Pretzel: It didn't catch on with consumers.

* The "Reese's" Peanut Butter Cup with Pretzels: It wasn't as well-received as other Reese's products.

There are many other candy bars that have come and gone, but ultimately success and failure are subjective.

To get a more specific answer, you'd need to clarify:

* What constitutes "failure"? Poor sales? Bad reviews? Lack of brand recognition?

* What timeframe are we talking about? Some candy bars that failed in the past might have been successful at the time.

Let me know if you have more information!