I don't recall being able to freely transfer between two worlds on the fly in Ocarina of Time (referring to Twilight Princess), nor do I remember the added depth to the sword combat, or the different functions of the new items. Likewise, there was no real 'story' to Mario 64 as there was in Sunshine, nor were there the special challenge levels, use of Yoshi (who had different abilities based upon the food he eats)in a 3D Mario title or the water-pack (which works much better than people give credit for). Then we've gotten such additions to the Mario-Kart franchise as drifting, online play, dual-piloting, motorbikes, trick-boosts, etc. Just because the games are similar at their very core does not make them equal. The little changes add up, and usually to something highly improved.