Analogy: think back on riding the swings in kindergarten. Was it fun? Now, imagine going back to those swings exactly as they were, and sitting in them now, as an adult. They're too small. They don't fit. Your feet drag on the ground because they're so low to the ground. The bar over your head is low enough that you can reach out and touch it, and even at the highest the swing will go, it's only about chest high when you're standing up. It's exactly the same swing, but riding on it now is a very different experience, yes?
Before we talk about layering, it's important to talk about the sharding technology used in modern-day World of Warcraft. When a zone in the game becomes overpopulated, players will be seamlessly moved onto a different shard, which is essentially another instance of the same zone. It is important to note that you will still be able to play with your friends, because you are moved to the same shard when you create a party.
We spoke with two Blizzard developers who have been working on WoW Classic, and as they explained, recreating World of Warcraft 1.12 involved reintroducing bugs that have long since been patched out of the game. But even they have had to check their work against WoW’s long update history, since the time at which certain features were introduced or bugs removed has gotten a bit fuzzy.

Nov 15 Thank you for the demo I just want to say thank you to Blizzard for the demo. I seriously had so much fun - so much more fun than I've had trying to play wow in YEARS. I know not everything was 100% accurate to classic, but it was just a demo so that doesn't worry me too much. I still had a million times more fun playing that demo than retail in any case. THE THINGS I LOVED: (1) I died so much. Like... SO MUCH, and that's alright! Once I finally finished whatever it was I was doing, it felt really rewarding! My group and I were actually laughing when we party wiped. No one insulted anyone or pointed blame, we just had fun. (2) Things took time. The journey mattered, it wasn't just about hitting end game asap. I felt accomplished at the end of all those time consuming things I did. (3) I had fun exploring! I spent so much time just running around, not knowing what the heck to do, but that was FUN. I had FUN getting lost and finding treasure chests. (4) Seeing the classic models again! Tbh, the races all look rubbery and stupid now... I honestly think the old racial looks are nicer. (5) Reading quests was necessary again, so the story mattered to me. No one booted me from the party for "taking too long" because I wanted to read. (6) The community! There were actually people doing RP stuff and talking in character. Everyone in the chat was just having fun. (7) All of the inconveniences - running out of mana, no mounts, running slowly on foot, little or no flightpaths... These things are fun because they're not just handed to me. I had to work hard and play the game to get things. (8) People constantly buffed other players, because that small boost could be the reason you didn't die when a roaming centaur attacked you from behind. THE THINGS I WAS CONCERNED ABOUT: (1) I've heard rumors about possible sharding... PLEASE DO NOT SHARD. PLEASE. I can understand if it's temporary just for the initial launch, and only for starting zones. I think that is a decent enough compromise for the inevitable problem of overpopulation for the first few weeks. But if we're talking about full scale realm sharding, PLEASE DO NOT! Cross-realm features and sharding are what ruined communities in wow, same with dungeon finder and other such things, and these features are very unwanted for a classic player like me. (2) The elite raptor I tamed as a hunter was not stronger than the non-elite raptor I tamed at the same level. In classic, elite animals had better stats as hunter pets once tamed, compared to the same non-elite version of that animal at the same level. (3) I think the mana and health regen rates were a bit too high? I'm not certain, but if they were I honestly want them to be genuine. It's okay if it's hard - challenges make games fun! Anyway, thank you again! I had a ton of fun, and as long as classic is true to classic with all of its pros AND cons, I feel certain that it will be a success.Sarai10 Nov 15
This was a good start, but there were issues with how the developers used to handle updates to the database data. Unlike the source code, for which Blizzard had archives for multiple branches of the game that could be worked on and developed as separate pieces, early database data was overwritten with each commensurate update. Thankfully, that problem was fixed very quickly after launch, and when we looked, we found data going back to version 1.12—and even earlier.
Blizzard won’t just be picking names out of a hat to decide who gets to participate in the World of Warcraft Classic beta. In order to have a good chance at being considered, you’ll need to show that you’re a dedicated player. According to the games website, you’ll need to have an active subscription or active game time on our Battle.net account to be considered for the testing period.
Before we talk about layering, it's important to talk about the sharding technology used in modern-day World of Warcraft. When a zone in the game becomes overpopulated, players will be seamlessly moved onto a different shard, which is essentially another instance of the same zone. It is important to note that you will still be able to play with your friends, because you are moved to the same shard when you create a party.
Some class systems from the original game simply don’t have a modern equivalent. The class probably most affected by this is the hunter. The pet happiness and loyalty systems were removed a long time ago, as well as pet training and the ability to use both a ranged weapon and a melee weapon. In these cases, converting the old data to the new system wouldn’t work, simply because there is no new system to match. In this instance, we had to bring back the old code—and we did. Fortunately, the restoration went smoothly, though the reality of having to buy arrows or feed their pets again took a few people in our internal tests by surprise.

 ":"  -  Any time a step ends in a ":" instead of a "." means that the next step is part of the current step you are on.  This generally means the next step should be done while working on the current step.  This means every "start working on" or "continue working on" will end in a ":".  But this is used with other occasions as well, so keep this in mind.


In the end, while it may be a huge cop-out, it really does come down to personal preference. Some people will simply not be able to handle the huge downtime between pulls, not being able to buy a new skill rank because you spent all your money on food and drinks (mages were popular for a reason back then), the very slow pace of leveling, and a whole lot more frustrations and not user-friendly features. On the other hand, the experience really is significantly different enough from modern WoW that it does feel enough like a "new" game, or at least a new and different expansion. An expansion that has many more differences than the last 3 or so, something that's both new and old and familiar. And, yes, it also offers massive quantities of nostalgia for those of us that played Vanilla, but what's so wrong about that?

In this form, there is much less wasted space and spells are no longer limited to three effects. But before we can load any database data, we need to transform the old data layout into the new one. This is not limited to spells, as almost every game system (including items, creatures, player characters, spawning, AI, and more) has had its database layout altered over the years.
Rogue combo points posed another challenge, because the game’s modern resource system knows how to gain and spend combo points, but not how to lose them when changing targets. There are also the older combat formulas to consider, so we had to bring back the code for the prior combat formulas including critical hits and crushing blows. Their chance to occur is also modified by the difference between the defender’s defense and the attacker’s weapon skill. Yes—weapon skill is back. We had the data for this aspect of the classic game, but we also needed to restore the code that increased your skills when you used them and made your skill level affect your chance to hit or get a glancing blow.
To actually get access to the beta, which has already started and continue to add more players, you need to sign up via your Blizzard account management page. Under Games & Subscriptions, scroll down to Beta Access and visit the Beta Profile Settings page. Once there, you’ll see a grid of available betas you can opt into. Once you’ve checked WoW Classic, hit Update Preferences and you’re set.
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