Sonic & Knuckles, the lock-on expansion adding Knuckles to previous Sonic games. Gorgeous, essential, one of the best 16-bit Sonics with its unique lock-on.
Your verdict
Category
Platformer1 player3+
Description
Sonic and Knuckles embark on a Death Egg adventure with the lock-on system in this emblematic Sega platformer. Published by Sega, released in Japan in October 1994. Platformer with separately playable Sonic and Knuckles, new Angel Island zone and unique lock-on system.
Sonic & Knuckles review
MAX
Art direction
★★★★★
"Iconic"
MAX
Music
★★★★★
"Legendary"
1/5
Story
★★★★★
"Anecdotal"
Dazzling colours, looping scenery and heady speed: Sonic imposes a pop visual identity of perfect readability, since become legendary. The roundness of the sprites and the vividness of the hues overflow with energy. This art direction, joyful and polished, defines the golden age of the Sega platformer and hasn't aged a day.
Conceived as the grand finale of the trilogy, the music unfurls memorable themes, from Lava Reef to Flying Battery, and the unforgettable title theme. Rich and inventive, it embraces the scope of Sonic and Knuckles's adventure with constant flair. This sonic achievement magnificently crowns the hedgehog's golden age.
Gameplay
"Masterful"
Gliding along walls, soaring and climbing with Knuckles opens up fresh trajectories through stages built with remarkable density. The famous lock-on cartridge also let it extend the earlier episodes. Beyond the speed, it's the intelligence of the level design that still strikes you, making it a peak of Mega Drive platforming.
Fun
"From the very first seconds"
Swapping raw speed for a Knuckles who can glide and climb reshuffles the level design: you reach passages the hedgehog will never see. Blasting forward still thrills, but the freedom to carve your own routes adds a fresh flavor. And the lock-on cartridge, which plugs into the other games, stretches the fun almost endlessly. Clever, fast and inexhaustible.
Addictiveness
"Obsessive"
Charging at full tilt, climbing and gliding with Knuckles, then sniffing out hidden routes keeps reviving the urge to tackle the next zone. Emeralds to collect, shortcuts to memorize and levels riddled with secrets feed endless replay value. A few demanding stretches break the rhythm, but that mastered speed and the lock-on cartridge keep their pull fully intact.
Difficulty
"Balanced"
Lifespan
"Massive"
Beyond its breakneck dash, this entry introduces the lock-on system and two heroes with distinct abilities, multiplying the paths and the secrets to ferret out. Replaying to find every Emerald and explore each zone stretches the adventure considerably. That generosity, paired with clever replay value, explains the lasting attachment of platformer fans.
Sonic & Knuckles is the international edition of the Sonic Team/Sega game, released with the unique Lock-On Cartridge technology that lets Sonic 1, 2 and 3 be connected on top to generate merged content. Its collector value is exceptional: it is one of the most singular Sega hardware innovations of the 16-bit market, never reproduced elsewhere.
A cult cover
Sonic and Knuckles face off, blue against red, in a composition that snaps like a poster of duel and rivalry. The metallic-gold lettering of the logo, echoing the famous lock-on cartridge, adds an instantly recognizable premium touch. Dynamic and colorful, the image sums up the rivalry at the game's heart and makes you want to jump in.
Is Sonic & Knuckles still worth playing in 2026?
An official sequel to Sonic 3 by Sega Technical Institute, Sonic & Knuckles offers a dynamic adventure with Knuckles as new playable character and the revolutionary lock on technology allowing cartridge combination with previous entries. The art direction faithful to previous entries, varied levels and frantic pace make it an absolute peak of the Sonic saga. For anyone fond of Sonic or wishing to discover an absolute classic, an absolutely essential recommendation today still truly here indeed.
