[Roto13]

The N64 Expansion Pak (as it was called) was required for certain games to run at all (Majora's Mask and Donkey Kong 64), was also required for certain parts of certain games (most of Perfect Dark's multiplayer mode and the entirety of it's single player mode), and just prettied up certain other games (Star Wars Rogue Squadron).

I can see this being standard for a lot of future games, much like the Expansion Pak. Especially if they package it with a big-name game, like they did with Donkey Kong 64.