I recently learned that, through a leaked WB Dev harddrive, a lot of things were uncovered, including bits and pieces from the earliest, 2007 version of Arkham Asylum. Not a whole different game, mind you, mostly just some different textures and sounds. These are the most obvious differences, aside from a different looking gadget-selection
Not huge on the Batsuit design or Joker's spikey hair. DEFINITELY not a fan of how Gordon looks. Scarecrow's toxin being green instead of orange is just kind of whatever, doesn't really make that much of a difference to me
Not really a fan of the gadget select, either. Feels way too Schumacher-y
You can find the mod that restores this stuff here, if you're interested