Sonic & Knuckles (Prototype 0525)

OSonic & Knuckles Prototype 0525 was released by drx during the February 23rd, 2008 proto dump. Unlike other prototypes, this one is already locked-on to Sonic 3 and still contains data from Sonic 3 Limited Edition 0517, suggesting Sonic & Knuckles was built from Sonic 3C. If the Sonic & Knuckles part was split from the Sonic 3 part, the game won't boot due to being dependent on Sonic 3 data. And even if it did, it would be very broken.

Cheats

 * Level Select & Debug Mode: Enabled by default.
 * All Chaos Emeralds: 02, 04, 06, 08 on the Sound Test.