Huh?
I asked you what an extreme game was.
you said "what would take more system resources, Pac-Man or COD?" However, that doesn't answer the question I posed.
By that definition, all "extreme games" are relative. By comparison to Atari 2600 Pac-Man, for example, Super Mario Bros. 3 could be called an "Extreme game". I think a far better term to use would be a
resource-demanding game. "Extreme" basically means the furthest or highest extent of something, so saying "extreme game" is sort of meaningless, unless there is a lot of information the reader is supposed to infer (in your case, Extremely resource demanding, as opposed to extremely boring or extremely repetitive).