Dark Souls II

Dark Souls 2 is the most well known for being the most difficult for challenge runs due to the Adaptability stat and some of the bosses being extremely difficult for certain runs.

There are a lot of challenges to enjoy:

SL1 CoC

No Death, No Bonfire

SL1 CoC No Rolling/Blocking/Parrying

SL1 CoC Broken ladle only

SL1 NG+7 CoC

SL1 NG+7 CoC Broken ladle only

SL1 NG+7 CoC No Rolling/Blocking/Parrying

No Hit