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emulator: Sonic 1 & 2 (2013) Decompilation
type: standalone
core_classification: game_engine
source: "https://github.com/RSDKModding/RSDKv4-Decompilation"
upstream: "https://github.com/RSDKModding/RSDKv4-Decompilation"
source_commit: "a7f5195e21fdad7b75e4587e249013feeea9e6f3"
core_version: "1.3.3"
profiled_date: "2026-10-04"
display_name: "Sonic 1 & 2 (2013) (RSDKv4 Decomp)"
cores: [sonicretro]
systems: [sonic-1-2013, sonic-2-2013]
notes: |
Shared Retro Engine v4 decompilation driving the 2013 Christian Whitehead
mobile ports of Sonic the Hedgehog and Sonic the Hedgehog 2. One binary
per build. The game identity is derived from the GameConfig.bin inside
the loaded data pack (gameWindowText "Sonic 1" or "Sonic 2").
ref: RSDKv4/RetroEngine.cpp:423, RSDKv4/ModAPI.cpp:428
CheckRSDKFile opens the data pack and compares its first six bytes to
the "RSDKvB" signature. There is no checksum test. The engine falls
back to a loose Data/ + Bytecode/ tree if the pack is absent. When
GameConfig.bin cannot be loaded either way it writes a usage.txt that
asks for a pack named Engine.dataFile[0] (default "Data.rsdk").
ref: RSDKv4/Reader.cpp:25-102, RSDKv4/RetroEngine.cpp:296-331,
RSDKv4/Userdata.cpp:251-263, RSDKv4/RetroEngine.cpp:483-520
Up to four packs can be mounted (DataFile, DataFile2..4 in the Dev
section of settings.ini), and the extras default to Data2.rsdk, Data3.rsdk,
Data4.rsdk once declared.
ref: RSDKv4/Reader.hpp:38, RSDKv4/RetroEngine.cpp:324-331,
RSDKv4/Userdata.cpp:396-408
files:
- name: "Data.rsdk"
category: game_data
system: sonic-1-2013
required: true
source_ref: "RSDKv4/Userdata.cpp:251-252 (default name), RSDKv4/Userdata.cpp:396-397 (Dev:DataFile), RSDKv4/RetroEngine.cpp:316-321 (CheckRSDKFile call), RSDKv4/Reader.cpp:38-46 (signature check)"
note: |
Sonic the Hedgehog (2013) assets. Shipped with the official Sonic
Origins release and the delisted iOS/Android apps. The engine checks
the six-byte signature only. Content identity is read from the
embedded GameConfig.bin, not the pack hash.
- name: "Data.rsdk"
category: game_data
system: sonic-2-2013
required: true
source_ref: "RSDKv4/Userdata.cpp:251-252 (default name), RSDKv4/Userdata.cpp:396-397 (Dev:DataFile), RSDKv4/RetroEngine.cpp:316-321 (CheckRSDKFile call), RSDKv4/Reader.cpp:38-46 (signature check)"
note: |
Sonic the Hedgehog 2 (2013) assets. Shipped with the official Sonic
Origins release and the delisted iOS/Android apps. Same default
file name as Sonic 1. Dev:DataFile in settings.ini names another.