Sonic & Knuckles, released in 1994 for the Sega Genesis, was a groundbreaking game that allowed players to combine it with Sonic the Hedgehog 2 and Sonic 3. This "lock-on technology" provided extended gameplay and storylines. Sonic & Knuckles itself features Knuckles the Echidna as the main playable character, known for his climbing and gliding abilities, contrasting with Sonic's speed. The game introduced new zones, bosses, and challenges, expanding the Sonic universe. Sega, the renowned video game company, developed and published Sonic & Knuckles, a pivotal entry in the Sonic the Hedgehog franchise that remains popular today due to its innovative features and challenging gameplay.

Sonic & Knuckles + Sonic the Hedgehog (World)

Sonic & Johnny