The Elder Scrolls IV: Oblivion is an action RPG developed by Bethesda Game Studios and published by Bethesda Softworks and the Take-Two Interactive subsidiary 2K Games. [Infos from Wikipedia]
Ace.dark posted an interesting topic in our forum, in which he explain that thanks to the Elder Scrolls Construction Set and the use of the Developers Console (brought up by pressing ~ on your keyboard) it’s possible to find the removed Kvatch area that was shown at E3 2005, still hidden in the final game! It seems that there are even some unused items, areas and enemies that were forgotten in the code.
If you have the PC version of the game you can download this file that adds some of the spells and items not normally available to normal users. In the Imperial City in the market district, there is a shop keep that will sell the beta items in Merchants Inn, he is always there but does not always sell the same items.
Thanks a lot to Ace.dark for the contribution!
Videos:
Part of an interesting demonstration of the beta. This demonstrates the original intentions for Radiant AI. Radiant AI was cut back before release because it was difficult to keep the game world from falling apart.