Back in the cartridge days Sonic and Knuckles had the ability to plug the old sonic games (lock On) in to the top of the cartridge to unlock new zones and other goodies. Well Sega has brought this ability to the Wii Virtual Console.
If you have Sonic the Hedgehog 1, 2, and/or 3 AND you have Sonic & Knuckles, you can unlock a variety of special features:
Sonic the Hedgehog: Unlocks the game Blue Sphere, the Chaos Emeralds bonus stage from Sonic 3.
Sonic the Hedgehog 2: Have the option to play as Knuckles in Sonic 2! This includes using Knuckles climbing abilities to reach areas that were previously inaccessible, and also makes some areas of the game more challenging because of Knuckles weaker jumping ability.
Sonic the Hedgehog 3: Play through Sonic 3 as Knuckles, and complete the original storyline!
That last one is the most enjoyable to me as it also unlocks the Super Chaos Emeralds. If you get all the Chaos emeralds before the end of Sonic 3 then when Sonic & Knuckles starts you can attempt to get all the Super Chaos Emeralds. This allows you to unlock Hyper Sonic, Hyper Knuckles, or Super Tails each with new abilities.
Hyper Sonic can double jump and run faster than Super Sonic. Hyper Knuckles can go faster and when he glides onto a wall it causes an earthquake, killing any enemies nearby. Super Tails has his speed increase and 4 little chickies appear next to him. They knock out an enemy every time they see one, they will even hit bosses!
A nice addition to the Wii Virtual Console Line up.
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