Batman: Arkham Asylum is an action-adventure stealth video game based on DC Comics’ Batman for PlayStation 3, Xbox 360 and Microsoft Windows. It was developed by Rocksteady Studios and published by Eidos Interactive in conjunction with Warner Bros. Interactive Entertainment and DC Comics and was released in 2009. [Info from Wikipedia]
Throughout Batman: Arkham Asylums development the developers were shooting for a hard T rating. Based on early screens it seems that they intended for the game to have blood, but it appears that they had to tone it down to get the rating that they wanted.
Also, as we can read at Game Informer, it seems that the combat system in the game was changed at least 3 times before chosing the final one:
Combat went through three distinct revisions – the first one being a full rhythm action game! The second one was prototyped in 2D, which popped up whenever you got into a fight, and involved colored circles bashing into each other. This actually formed the basis of the final system.
FMMC noticed that Batman’s gliding was impaired when his cape was torn in the beta.
Thanks to Robert Seddon for the contribution!