This is a gray area. Sonic 3 & Knuckles is copyrighted by Sega. While Sega has historically been lenient on fan projects and classic ROMs, they have not officially released this specific locked-on title for free.
Without Sonic & Knuckles locked on, the ending is incomplete. When you play the full game, you see the Doomsday Zone—a Hyper Sonic fight against the Death Egg robot in space.
: Unlike the standalone Sonic 3, the combined version lets you play through all Sonic 3 levels as Knuckles, accessing hidden paths designed specifically for his gliding and climbing abilities. Controls for Browser Play
The majority of "unblocked" versions of Sonic 3 & Knuckles do not run natively in the browser. Instead, they utilize WebAssembly (Wasm) or JavaScript ports of established emulators, such as:
Throughout the game, Sonic and Tails pursue Robotnik across various zones, constantly sabotaged by Knuckles’ traps.
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