Sonic-knuckles-wsonic3.bin — Confirmed

: This is a standard binary file extension for ROMs, containing the raw data of the game that an emulator or modern port can read. Why You Might Need This File

The name sonic-knuckles-wsonic3.bin is a technical shorthand for sonic-knuckles-wsonic3.bin

: This indicates the "Lock-On" technology originally used on the SEGA Genesis. The original Sonic & Knuckles cartridge featured a unique physical slot on top that allowed players to insert the Sonic 3 cartridge, effectively merging the two games into one massive experience. : This is a standard binary file extension

: This fan-made remaster requires the original ROM to ensure users legally own the game before providing enhanced features like widescreen support and 60fps gameplay. : This fan-made remaster requires the original ROM

Sonic 3 & Knuckles is widely considered one of the greatest platformers ever made. It was originally intended to be a single game, but was split into two ( Sonic 3 and Sonic & Knuckles ) due to time and cartridge cost constraints. The sonic-knuckles-wsonic3.bin file represents the realization of the developers' original vision: a seamless adventure spanning from Angel Island to the Doomsday Zone.

: Using the file in emulators like BizHawk or RetroArch to play the combined version of the game. How to Acquire It Legally