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I agree with you that the add ons are not vital. If I had not bought them I would still be busy replaying the real levels, because I never get tired of them. I did enjoy the add ons for a few weeks and I occasionally go and play them for a change, but they are definitely easier than the real game, and more of a novelty, so they don't attract our attention that much once the novelty wears off. Certainly, they are not necessary at all to enjoy the game. The same goes for the "expert levels" which we get for free - a cute challenge, but not a vital part of the real game.