Fall Guys’ 4.5 update appears to include far more than Mediatonic intended – specifically, some of the game’s underlying source code and libraries.
Mediatonic’s recent Season 4.5 update for Fall Guys: Ultimate Knockout appears to include the game’s source code, something that could theoretically be exploited by hackers or even rival companies looking to make knockoffs. The mistake appears to be related to a tool used when developing with the Unity game engine.
Fall Guys first launched in August 2020, becoming an overnight sensation as a friendlier alternative to battle royale games like PUBG or Fortnite. Instead of gunfights, players have to survive a series of Wipeout-style elimination courses, the ultimate winner being either the last person standing or the first to make it across a finish line, depending on the course. Mediatonic was bought by Epic Games in March 2021, putting Fall Guys and Fortnite under the same banner. Fall Guys is currently available only for PC and PlayStation – Xbox and Switch ports are due later in 2021, possibly 2022. China is getting an exclusive mobile port of the game.
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One of the folders in the updated Fall Guys PC release is labeled “FallGuys_client_BackUpThisFolder_ButDontShipItWithYourGame,” notes user darklinkpower on Reddit. This includes 728 items in total, mostly C++ files and DLL libraries covering everything from the lobby to anti-cheat systems. Although the folder name may initially seem tongue-in-cheek, it actually points to the cause of the mistake – “BackUpThisFolder_ButDontShipItWithYourGame” is a name automatically generated by IL2CPP, a Unity tool for converting code to C++ . Normally players are only supposed to have access to executable files, which are still how the game loads.
Mediatonic will presumably fix the error in an upcoming patch. The company may or may not be in any extra danger – determined hackers were likely already able to decompile Fall Guys, the gaffe simply making files easier to see. If so the only real damage might be the unnecessary space consumed on hard drives. The game also depends on servers, so there’s only so much the client source code is useful for.
Fall Guys Season 4.5 includes a variety of important additions, perhaps the most important being crossplay, though only in matchmaking and not parties. A reporting system can be used to identify cheaters, and there are two new round types: Slimescraper, in which players have to outrun slime across several floors, and Button Bashers, which sets up one-on-one duels for points. Existing rounds have been given 55 additional variations, such as low-gravity in Hex-a-gone and Thin Ice. Mediatonic has lastly cleaned up latency problems and opened Custom Lobbies to everyone, allowing matches to start with as few as four people.
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