Sonic & Knuckles

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Development
Sonic & Knuckles was known as the second half of Sonic the Hedgehog 3. The reason of this split between the two games was from the time of release date and space on the 16 bit cartridge. Making a 64 bit cartridge during the mid 90's was too expensive to make and sell. Instead they made special " Lock On Technology " which would connect two Sonic games together. Also having the space from two cartridges made a longer game experience.

Lock On Technology
With the power of Lock On Technology you could put one Sonic game into the Sonic & Knuckles cartridge to have a separate game. If you were to put Sonic the Hedgehog 3 Locked in with Sonic & Knuckles you would get Sonic the Hedgehog 3 and Knuckles, this was known as the true Sonic the Hedgehog 3 with all of the levels, playable characters and save features. Connected with Sonic the Hedgehog 2 you would be able to play as Knuckles in Sonic the Hedgehog 2. However having Knuckles playable in the original Sonic the Hedgehog was planned but due to a palette glitch it was not introduced. Instead the game Blue Sphere was included as long as you put in any other Megadrive/Genesis game you could play it. Lock On Technology ROCKS DUDE!

Gameplay
Being the second half of Sonic the Hedgehog 3 the gameplay is completely the same as the first half with the same moves of the jump, spindash, insta-shield, and other abilitys differing from character to character are all the same as the previous title. The types of shields are also the same having water, electric, and fire all the abilities are the same with the exception of the water shield no longer has the effect to let you breathe underwater due to having no water in this half.