How can difficulty options be improved on?

[xen123]

In a game you usually get easy, normal or hard. Most of the times this simply means enemies do more damage to you. I know this differs game from game but how could a game add/change things to make a game more challenging but without increasing enemy damage? If you have examples of games that do, then please post them?

[superbatmanx1]

Possibly what they can do is just more enemies, smarter AI, or faster enemies, these possibilities are possbly endless. I don't know how games difficulty modes work. My friend once put me on Legendary on Halo 4 and to my surprised I kicked some major butt, when usually I die all the time on even Recruit.

[Kamheaby]

the whole time I thought it was some parody of old Nintendo commercials and other similar things, but then I saw the end and.... is this a real ad?