Nightmare Mode analyzes the necessity for difficulty settings in games.
"The pursuit of a challenge can be a driving force in life. The accomplishment of something thought to be unobtainable has a certain allure which some find irresistible. Game designers tend to play off of this concept, creating challenges that seem insurmountable in the context of the game world. Typically there will be an option for the player to affect the likelihood of beating the odds through game difficulty. As a designer, the proper implementation of difficulty, in my opinion, is instituting a learning curve and building from there. Once the player has gleaned the knowledge the game has presented, the designer is free to introduce complex obstacles that utilize this knowledge in varying ways. Approaching the difficulty question from this angle allows designers to create more involving situations during the progression of the game. This concept of “learning in order to succeed” seems to eradicate the necessity of a difficulty option altogether."