A massive information leak appears to have brought entire lists of achievements from upcoming and unannounced PC games to the Internet, including Persona 6 and Kingdom Hearts 4. The lists were removed and added to several websites, including SteamDB and achievement tracking website Exophase overnight. X3sphere, the owner of Exophase, told ResetEra that they believed the leak was the result of a “possible error on Valve’s part,” after the Steam API apparently gained access to achievement lists that should be private. Here’s a Kingdom Hearts 4 trailer for the Coco world. Watch it on YouTube “I normally never see games without a real name listed with achievements,” X3sphere continued, “however, over the last hour or so, many have (when there’s an unknown name, we just set it to AppID).” While the full extent of this apparent (and still unconfirmed) leak is still unclear, the number of games apparently impacted or revealed is huge. It also means spoilers abound. Reddit user KingdomHeartsII put together a list of the games that have been found so far, including more than a dozen that have yet to be announced. Highlights among the list include a Sea of Thieves “sequel/spin-off”, a Twin Peaks game, a Candy Crush game, a Sonic game and a Shrek game. There was also a standout Balatro game, although Balatro creator Localthunk issued a comment to PC Gamer stating that the game: “is not affiliated with me or Balatro at all. A lot of people like to emulate the Balatro design language and that’s it.” Additionally, although Toem 2 is listed as unannounced, that game has already been announced. All of this to say that that list should be taken with a large grain of salt, as should the veracity of the games that have been hoovered up by websites like X3Sphere. It’s worth noting that some of these achievement lists include potential spoilers. So if, for example, you’re a die-hard Kingdom Hearts or Megaman fan, you probably shouldn’t take a look at the leaks if you want to get in without anything being ruined ahead of time, in case they’re legit. Eurogamer has contacted Valve for comment and we will update this article if we receive a response. We’ve also reached out to developers and publishers of several apparently leaked games for comment.