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If you’re curious about reverse engineering, can help you get started.Ĭontinue reading “Decompiling Sonic Runners“ → Posted in Games, Reverse Engineering Tagged c sharp, decompile, Ghidra, GLSL, hsl, sonic, unity, unity engine The community continues adding new features and refining the game, which is very satisfying. Now the client has new game modes, no ads, and a proper offline mode. Additionally, all the shaders were in OpenGL Shading Language (GLSL), which meant rewriting them in High-Level Shading Language (HLSL) and checking that they matched the original GLSL when building for Android. Since an open source server already existed, it was trivial to validate the changes. Luckily, the library was a later addition, and earlier versions of its functions still lingered in the C# code. The library handled AES encryption and communication with the server. However, one native code library called UnmanagedProcess was designed to confuse reverse engineering efforts. Unfortunately, the build of Unity used by the game is from 2012, meaning many of the tools designed for much later versions of Unity were inoperable. Compared to many decompilation projects, Sonic Runners was pretty easy as it uses Unity, which means most of the code is in C#. However, as phones with notched displays came out and suggestions for improvements stacked up, the community realized a new client would bring immense benefits. However, the game required a constant online connection, so once the servers were offline, it rendered the over five million downloads unplayable.Ī team of developers worked to reverse engineer the server, and with a little bit of binary hacking, the client could be patched to connect to a community-hosted server instead. A little over a year later, the game was discontinued. Despite getting praise for the gameplay, it received mixed reviews for the pop-up ads and pay-to-play elements. The game was a 2D endless runner released on mobile platforms. recently set out to decompile the 2015 game Sonic Runners. Usually, when you hear about games being decompiled and rebuilt, the games are often decades-old relics, loving and saved from the ravages of time.
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