This did not just simply come randomly, however. Players have been demanding and asking for World of Warcraft Classic for many years now. And Blizzard has likely learned from companies like Jagex that regained a huge portion of their player-base with the launch of Old School RuneScape, which prior to it had a 2006Scape private server. Similarly, World of Warcraft Classic/Vanilla has been around in the form of private servers for many years now and has been very popular. Even top players and streamers have been known to play on these private servers. The only issue is Blizzard were not the ones profiting from these ventures.
File data: This is often very dense data like 3D models, textures, animations and terrain. Our user interface is built up from XML and Lua files. Many of the art files do not use the same file formats that commercial art tools spit out. Our build pipeline takes these raw art files and translates them into something optimized for our game to read and process.
Over the 15 years since the launch of World of Warcraft, Blizzard has slowly sanded off some of Azeroth's rough edges. The world is still bustling with dangerous dungeons and harrowing raids, but these days it's a kinder, friendlier world. World of Warcraft Classic aims to fix that, to make Azeroth dangerous again--although it retains a few of the modern niceties.
This is the first faction exclusive class available only for the Alliance players. Paladins in World of Warcraft: Classic end-game were considered as one of the best single target healers around. However, other Paladin specs were not that popular. While Protection Paladins found their spot with tanking groups of mobs across the dungeons, Retribution Paladins weren’t very popular in the end-game. However, Paladins were amazing levelers and World PvP participants due to their amazing utility skills and ‘oh shit’ buttons such as Lay on Hands or Bubble.

So we asked ourselves, would it still be possible to deliver an authentic classic experience if we took our modern code, with all its back-end improvements and changes, and used it to process the Patch 1.12 game data? While that might seem counterintuitive, this would inherently include classic systems like skill ranks, old quests and terrain, talents, and so on, while later features like Transmog and Achievements would effectively not exist because they were entirely absent from the data. After weeks of R&D, experimentation, and prototyping, we were confident we could deliver the classic WoW content and gameplay without sacrificing the literally millions of hours put in to back-end development over the past 13 years.
As I wrote in my preview, World of Warcraft Classic has much more to offer than just nostalgia. The world is filled to the brim with abstruse and challenging elements that coerce you to make and maintain relationships with other players if you want to succeed. As a result, I believe that WoW Classic’s MMO ecosystem offers an experience that can’t be found anywhere else in 2019. And, it would appear I’m not the only one who sees something special in the more-than-decade-old game. Just last week more than 100,000 viewers congregated in the chat of popular streamer “Asmongold” to watch him successfully fell Edwin Van Cleef in the classic Deadmines. A vindicating spectacle that would have been impossible to witness without Blizzard overcoming certain technical hurdles.  

As I wrote in my preview, World of Warcraft Classic has much more to offer than just nostalgia. The world is filled to the brim with abstruse and challenging elements that coerce you to make and maintain relationships with other players if you want to succeed. As a result, I believe that WoW Classic’s MMO ecosystem offers an experience that can’t be found anywhere else in 2019. And, it would appear I’m not the only one who sees something special in the more-than-decade-old game. Just last week more than 100,000 viewers congregated in the chat of popular streamer “Asmongold” to watch him successfully fell Edwin Van Cleef in the classic Deadmines. A vindicating spectacle that would have been impossible to witness without Blizzard overcoming certain technical hurdles. 
"Challenge is part of it," Birmingham continued. "The world feels dangerous. There are difficult group quests out in the world, elite quests that you can't do by yourself, or you would have to over-level if you wanted to do them by yourself. Where they really push you to find somebody else to help you out, or out level them and come back later, or you can just leave them and go on. You don't have to complete every quest in every zone. You can choose your path through the world. So I think that is exactly the classic gameplay that people are looking for."
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