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.




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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?


This cartridge is the only gaming cartridge to ever feature "lock-on technology" (This type of set-up was used once before for the 'Game Genie' - an additional cart that sat between the cartridge itself and the console to enable the manipulation of code to gain extras like more lives or invulnerability). The cartridge has a cartridge slot on the top which you could plug in any Mega Drive/Genesis cartridge. Plugging in Sonic 3 allowed you to play Sonic 3 as it was meant to be, allowing you to play both games combined, as well as use Knuckles in the Sonic 3 stages (which had different routes than Sonic & Tails' stages), as well as Tails in the Sonic & Knuckles stages which also allowed Tails to become Super Tails for the first (and to my knowledge only, excluding the debug cheat in Sonic 2) time, he had the same abilities as Super Sonic & Knuckles, but he also had 4 invulnerable birds which would attack any enemy nearby. You could also become Hyper Sonic & Hyper Knuckles which were supped-up version of Super Sonic & Knuckles. If you plugged in Sonic 2, you could play Sonic 2 with Knuckles, in which they added extra areas that only Knuckles could reach, and it made the last boos more difficult as Knuckles can't jump as high as Sonic & Tails which limited the opportunities to attack. If you plugged in Sonic 1, you can play 1000 different 3D special stages after holding A, B & C and pressing START. Plugging in any other game would allow you to play 1 3D special stage, but that same stage is available when locking on Sonic 1. See more »


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


References Flicky (1984) See more »

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User Reviews

A 4th Adventure for Sonic
30 August 2003 | by (england) – See all my reviews

Sonic is back for the 4th time, but this time he's on a team with Knuckles. The 4th adventure takes you on an excitement adventure, the same speed skills and more new adventure's levels filed with loops and new creatures. Sonic and Knuckles battle their way to get back the Chaos emraids for the 4th time. can they get them or will Dr Robotnik have them to himself forever. We'll have to find out as we can play the 4th adventure game.

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