The Nintendo 64 memory expansion pak upgrade is not vital for the most part, in terms of plugging up and playing many of the great titles already released for this console. But there are a few titles that absolutely require this upgrade. The Legend of Zelda Majora's Mask and Donkey Kong 64 are two such titles for example, that cannot be accessed without this upgrade. Perfect Dark is one such title which offers minimal gameplay and locks players out of many of it's richer features due to the lack of available memory to run all of it's features properly. But I think you'll find that even if Donkey kong 64, Perfect dark, or Zelda Majora's Mask isn't your thing, you'll still be wanting to consider purchasing this Ram expansion for a few key reasons.