There are a few major types of difficulty out there in video games. (operationrainfall.com)
It is noteworthy that although Worcester began by using hypnosis in many different types of difficulties, he eventually limited it to use with some alcoholics. (religion-online.org)
A new type of difficulty is thrown at you in the form of strict loadout limits, with certain missions asking you to select a weapon and forcing you to stick with it until completion. (gamestm.co.uk)