Sonic & Knuckles Sega Genesis / Mega Drive intro + demo gameplay
2Sonic 3 & Knuckles Sega Genesis / Mega Drive intro + demonstration gameplay
Sonic & Knuckles[a] is a 1994 side-scrolling platform video game developed by Sonic Team and published by Sega for the Sega Genesis. An installment in the main Sonic the Hedgehog series, it is a direct sequel to Sonic the Hedgehog 3, which was released earlier that year. The story follows Sonic the Hedgehog and Knuckles the Echidna in their respective quests to save Angel Island; Sonic tries to prevent Dr. Robotnik from relaunching his orbital weapon, the Death Egg, while Knuckles scuffles with Robotnik's minion, known as EggRobo.
Development of Sonic & Knuckles began after the release of Sonic the Hedgehog 2, and was developed simultaneously alongside Sonic 3. The two games were originally intended to be released as a single game; however, due to time constraints and the cost of a large-memory-capacity cartridge, Sega split the project in two. The Sonic & Knuckles cartridge features "lock-on technology" that allows the game to connect to the Sonic the Hedgehog 2 or Sonic the Hedgehog 3 cartridges, combining elements from either game.
Sonic & Knuckles was met with positive reviews. Critics were impressed with the lock-on technology, though some made note of its similarity to its predecessor. It has since been re-released in various compilations and on digital platforms such as Xbox Live Arcade, Virtual Console, and Steam.
Since Sonic & Knuckles and Sonic the Hedgehog 3 were initially developed as one game, their gameplay is similar: both are 2D side-scrolling platformers with similar level design, graphics, and game mechanics. However, in Sonic & Knuckles, unlike in Sonic 3, the player chooses either Sonic or Knuckles at the title screen, Miles "Tails" Prower is not available to select, and the player cannot control two characters together. There is also no multiplayer mode or save feature.
The player character moves through six levels, each divided into two acts. The first act of each level ends with a miniboss fight with one of Dr. Robotnik's robots, while the second ends with a regular boss fight with Robotnik (or EggRobo in Knuckles' campaign). Sonic and Knuckles traverse levels differently: Sonic can jump slightly higher, is faster and can use the insta-shield ability which makes him invincible for a split-second, whereas Knuckles can glide, break obstacles and climb most walls. The levels also include cutscenes that differ based on the character selected, as Sonic and Knuckles are rivals for most of the game.
The game contains two types of bonus stages accessed by passing a checkpoint with at least 20 rings. The first type has Sonic or Knuckles orbit floating, glowing spheres, jetting off each one when a button is pressed, while a fence of light approaches from the bottom and will remove the player from the stage if touched. Collecting 50 rings in this stage earns the player a continue. The second type involves bouncing around a room with a slot machine in its center with the intention of winning extra lives and power-ups.
Special Stages are entered by finding giant rings hidden in secret passageways: the player is placed in a 3D environment and must turn all of a number of blue spheres red by running through them, but must avoid all red spheres, including formerly blue ones. Yellow spheres bounce the player long distances, and white spheres with red stars on them make the player walk backwards in the opposite direction. Completing a Special Stage earns the player a Chaos Emerald; collecting all seven Emeralds allows the player to turn into Super Sonic or Super Knuckles, more powerful versions of the characters.