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Several Nintendo franchises have fan versions which amp up the aspects of the games. Nintendo provides the solid base, but the insatiable fanbase want more and build up from that foundation.
Osu! Tatakae! Ouendan! has Osu, which on the higher difficulties look like a complete clusterfuck to somebody who has only played Ouendan.
Pokemon has Showdown and several other Pokemon online battlers which bypass the whole breeding aspect, as well as MMORPG styled games.
Smash Bros has Project M and other Brawl mods which modify gameplay speed and other aspects.
Mario has mods like Kaizo world which amp the difficulty level to cuh-razy proportions.