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To understand the significance of RSDKv1, it is useful to look at the progression of the RSDK framework, which has been meticulously documented by the modding community: Retro Sonic (2007). RSDKv2: Sonic Nexus (2008), Sonic XG. RSDKv3: Sonic CD (2011 Remaster). RSDKv4: Sonic 1 & 2 (2013 Remasters). RSDKv5/v5U: Sonic Mania (2017) and Sonic Origins.

At its core, the engine uses a single archive file (usually Data.rsdk ) that contains all the game's assets. Unlike ZIP files, the v1 RSDK format is a proprietary container. It stores: