Originally Posted by
sheath
By my own standards, a great sequel should leave the original (if it was a good game) intact while creating a new enough and more advanced game. These games should take a similar idea and improve on it, or take an entirely different direction on the same theme while making another good to great game. Sequels should not look or feel like expansion packs, they should simultaneously look, feel, sound and play similarly and totally different than any predecessors. They should be new games even if they share familiar elements. So, these are the kinds of games that I consider great sequels.
NES:
Super Mario Bros 2