Sonic the Hedgehog and Knuckles the Echidna, once enemies, now allies. Teamed together to stop that evil scientist, Dr. Ivo Robotnik, from taking control of the world with his crazed hover crafts and mad robots.




The Death Egg, Dr. Ivo Robotnik's space station, has once again crashed on Angel Island after the events of Sonic the Hedgehog 3. Robotnik needs power the Chaos Emeralds to power it up again, and because of this, Sonic and Tails have to find the Chaos Emeralds before him so they can stop his plans of world domination. However, Knuckles, the guardian of Angel Island and the Master Emerald, was tricked by Robotnik into thinking that Sonic and Tails are after the Master Emerald, so he is equally determined to stop the duo. But while all 3 are going round with each other, who's gonna stop Robotnik? Written by

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Release Date:

18 October 1994 (USA)  »

Also Known As:

Sonic 3 & Knuckles  »

Company Credits

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Technical Specs


Aspect Ratio:

1.33 : 1
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Did You Know?


Hidden Palace Zone derives from the underground cavern near Mt. Arakai in central Japan. It too is filled with precious stones, as well as ancient rock formations. See more »


In Sandopolis Act 1, after the boss is defeated, for some reason, the boss music continues to play. See more »


Featured in Death Battle: Donkey Kong VS Knuckles (2015) See more »

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User Reviews

The Fourth Journey and Beyond!
30 June 2003 | by (Buffalo, NY) – See all my reviews

Sonic & Knuckles is a terrific follow-up on Sonic 3. This would rightfully be called Sonic 4, since there's still unfinished business at the Floating Island.

In this story, Sonic knocked the Death Egg out of the sky only moments after it was re-launched. The spaceship crashes on top of a volcano, while Sonic is dropped off in the woodland regions. Robotnik will now need the master emerald to fully restore his spaceship. This time, the hedgehog has to go solo to bring down Dr. Robotnik. However, Knuckles is still trying to fight off the trouble infesting his island; he's still around interfering with Sonic's mission, but in the Hidden Palace, Knuckles discovers who the real culprit is.

First, there's Mushroom Hill Zone (the deciduous forest), Flying Battery Zone (Robotnik's revamped war plane), Sandopolis Zone (the desert), Lava Reef Zone (the volcanic region), Hidden Palace (where the master emerald is located), Sky Sanctuary Zone (the ruins of a sky community), and Death Egg Zone (a serious update on Robotnik's spaceship). The last zone would normally be the last stop, but if you collected all the emeralds, you go to the ultimate face-off with Dr. Robotnik in Doomsday Zone. After this, the expedition on the Floating Island will finally be over.

In between the mission, you again have to collect the seven chaos emeralds, and try collecting extra rings and shields in bonus stages.

The best part about Sonic & Knuckles is that it can be hooked up to other video games (namely Sonic 2 & 3). With Sonic 2, it's basically the same story with Knuckles as the only player. With Sonic 3, it's the one time Knuckles can be part of Sonic 3 (in where he's saving his own island), and Tails can be part of Sonic & Knuckles (in where he joins Sonic on the mission). Additionally, the collection of chaos emeralds will be followed by the collection of super emeralds. All chaos emeralds acquired will give Sonic and Knuckles super powers. All super emeralds acquired will give Sonic and Knuckles hyper powers, and Tails super powers. The two-part story on the Floating Island is combined into one big adventure!

Sonic & Knuckles is an excellent build-up on Sonic 3, and a powerful addition to the Sonic odyssey. This would definitely NOT be the last Sonic game made. To this day, Sonic the Hedgehog (along with Tails and Knuckles) continue to battle Dr. Robotnik's plans for world domination, while covering new ground, and meeting new friends.

At this point, Sonic the Hedgehog has really come a long way.

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