Well there have been loads but most people will have only played the top few so I don't know why I put them all down really.
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Arena is terrible Daggerfall has the biggest map in any video game, ever. Morrowind is everybody's "Nostalgic" favorite and because of this they all think it's the best Oblivion is the "red headed step child" to most because they "made it too easy" Skyrim got rid of the custom spells and further got rid of the creative elements of the series and made you more cookie cutter.