About

<h2>Overview</h2><figure data-ref-id="1300-256686" data-img-src="https://static.giantbomb.com/uploads/original/0/1264/256686-s_k_13.gif" data-size="small" data-align="right" data-embed-type="image" data-ratio="0.7"><a class="fluid-height" style="padding-bottom:70.0%" href="https://static.giantbomb.com/uploads/original/0/1264/256686-s_k_13.gif" data-ref-id="1300-256686"><img alt="Knuckles the Echidna is now in your control." src="https://www.giantbomb.com/a/uploads/original/0/1264/256686-s_k_13.gif" srcset="https://www.giantbomb.com/a/uploads/original/0/1264/256686-s_k_13.gif 320w" sizes="(max-width: 320px) 100vw, 320px" data-width="320"></a><figcaption>Knuckles the Echidna is now in your control.</figcaption></figure><p>Sonic &amp; Knuckles is a 2D action platformer developed by <a href="/sonic-team/3010-781/" data-ref-id="3010-781">Sonic Team</a> (with assistance from <a href="/sega-technical-institute/3010-1391/" data-ref-id="3010-1391">Sega Technical Institute</a>, which would be the last Sonic game they contributed to) and published by <a href="/sega/3010-62/" data-ref-id="3010-62">Sega</a> for the <a href="/genesis/3045-6/" data-ref-id="3045-6">Sega Genesis</a> on October 18, 1994.</p><p>The direct sequel to <a href="/sonic-the-hedgehog-3/3030-4628/" data-ref-id="3030-4628">Sonic the Hedgehog 3</a>, Sonic &amp; Knuckles continues the story of <a href="/sonic-the-hedgehog/3005-73/" data-ref-id="3005-73">Sonic the Hedgehog</a>, who must venture deeper through <a href="/angel-island/3035-876/" data-ref-id="3035-876">Angel Island</a> to track down <a href="/dr-robotnik/3005-293/" data-ref-id="3005-293">Dr. Robotnik</a> (whose orbital weapon, the <a href="/death-egg/3035-3884/" data-ref-id="3035-3884">Death Egg</a>, crashed back down to the floating island). Along the way, he is still being pursued by <a href="/knuckles/3005-204/" data-ref-id="3005-204">Knuckles the Echidna</a> who, still believing that Sonic is planning to steal the island's <a href="//www.giantbomb.com/master-emerald/3055-783/" data-ref-id="3055-783">Master Emerald</a>, hinders his progress and is still hiding the <a href="//www.giantbomb.com/chaos-emerald/3055-19/" data-ref-id="3055-19">Chaos Emeralds</a> around the floating island.</p><p>While <a href="//www.giantbomb.com/tails/3005-45/" data-ref-id="3005-45">Miles "Tails" Prower</a> is no longer a playable character (or companion), players can now play through the game as Knuckles (previously only playable in Sonic the Hedgehog 3's Competition Mode), in which he is less agile than Sonic (and cannot use the special jumping powers of elemental shields), but has the unique abilities to <a href="//www.giantbomb.com/gliding/3015-1924/" data-ref-id="3015-1924">glide through air</a>, <a href="//www.giantbomb.com/climbing/3015-1864/" data-ref-id="3015-1864">climb walls</a>, and punch out certain obstacles (as well as having to face more difficult boss battles as an added challenge). He has his own side-story, taking place after the main campaign, in which a surviving badnik (the <a href="/eggrobo/3005-23151/" data-ref-id="3005-23151">EggRobo</a>) takes Dr. Robotnik's place in finding the <a href="/master-emerald/3055-783/" data-ref-id="3055-783">Master Emerald</a> (though it is not sure, until the end of the game, who the <a href="/mecha-sonic/3005-23150/" data-ref-id="3005-23150">main antagonist</a> is).</p><figure data-align="right" data-img-src="https://static.giantbomb.com/uploads/original/3/30032/1139452-678px_sega_genesis__sonic___knuckles_locked_on_to_sonic3_flipped.jpg" data-ref-id="1300-1139452" data-size="small" data-embed-type="image" data-ratio="0.8834808259587"><a class="fluid-height" style="padding-bottom:88.3%" href="https://static.giantbomb.com/uploads/original/3/30032/1139452-678px_sega_genesis__sonic___knuckles_locked_on_to_sonic3_flipped.jpg" data-ref-id="1300-1139452"><img alt="The unique Sonic &amp; Knuckles cartridge, with Sonic the Hedgehog 3 locked on top of it." src="https://www.giantbomb.com/a/uploads/scale_small/3/30032/1139452-678px_sega_genesis__sonic___knuckles_locked_on_to_sonic3_flipped.jpg" srcset="https://www.giantbomb.com/a/uploads/original/3/30032/1139452-678px_sega_genesis__sonic___knuckles_locked_on_to_sonic3_flipped.jpg 678w, https://www.giantbomb.com/a/uploads/scale_medium/3/30032/1139452-678px_sega_genesis__sonic___knuckles_locked_on_to_sonic3_flipped.jpg 480w, https://www.giantbomb.com/a/uploads/scale_small/3/30032/1139452-678px_sega_genesis__sonic___knuckles_locked_on_to_sonic3_flipped.jpg 320w" sizes="(max-width: 320px) 100vw, 320px" data-width="320"></a><figcaption>The unique Sonic &amp; Knuckles cartridge, with Sonic the Hedgehog 3 locked on top of it.</figcaption></figure><p>Sonic &amp; Knuckles is the only Sega Genesis game to utilize special "lock-on technology" (in which the <a href="/oddly-shaped-cartridge/3015-4267/" data-ref-id="3015-4267">unique game cartridge</a> features its own Sega Genesis cartridge slot at the top, similar to the <a href="/game-genie/3000-21/" data-ref-id="3000-21">Game Genie</a> accessory), so that the game can access data from certain other Genesis games. This allows players to play through <a href="//www.giantbomb.com/sonic-the-hedgehog-2/3030-1662/" data-ref-id="3030-1662">Sonic the Hedgehog 2</a> as Knuckles (complete with his unique abilities), and allows players to combine both Sonic the Hedgehog 3 and Sonic &amp; Knuckles into one "complete" game with special features.</p><h3>Ports and Compilations</h3><p>The game was later ported (alongside Sonic the Hedgehog 3) by Sega to <a href="/pc/3045-94/" data-ref-id="3045-94">PC</a> (running Windows 95 and up) as Sonic &amp; Knuckles Collection (published by Sega for Japan in 1997 and <a href="/expert-software-inc/3010-1881/" data-ref-id="3010-1881">Expert</a> for North America in 1999). The game retains the same gameplay as the Sega Genesis version, but the music was re-done in <a href="http://en.wikipedia.org/wiki/MIDI" rel="nofollow ">MIDI</a> format. It also includes the option to play Sonic 3 &amp; Knuckles (both games locked-on) and also includes a Sonic-themed screensaver.</p><p>Sega compilations that include both Sonic &amp; Knuckles and all of its lock-on functionality (as separate modes) include <a href="/sonic-jam/3030-2391/" data-ref-id="3030-2391">Sonic Jam</a> (on July 31, 1997 for the <a href="/saturn/3045-42/" data-ref-id="3045-42">Saturn</a>), <a href="/sonic-mega-collection/3030-17691/" data-ref-id="3030-17691">Sonic Mega Collection</a> (on November 10, 2002 for the <a href="/gamecube/3045-23/" data-ref-id="3045-23">GameCube</a>), and <a href="/sonic-mega-collection-plus/3030-12297/" data-ref-id="3030-12297">Sonic Mega Collection Plus</a> (for the <a href="/playstation-2/3045-19/" data-ref-id="3045-19">PlayStation 2</a> and <a href="/xbox/3045-32/" data-ref-id="3045-32">Xbox</a> on November 2, 2004 and for the PC on March 9, 2007). <a href="/sonics-ultimate-genesis-collection/3030-24218/" data-ref-id="3030-24218">Sonic's Ultimate Genesis Collection</a> (for the <a href="/xbox-360/3045-20/" data-ref-id="3045-20">Xbox 360</a> and <a href="/playstation-3/3045-35/" data-ref-id="3045-35">PlayStation 3</a> on February 10, 2009) includes the game but none of the lock-on functionality. Sonic Classics Collection (for the <a href="/nintendo-ds/3045-52/" data-ref-id="3045-52">Nintendo DS</a> on March 2, 2010 in Europe only) includes the game and both the Sonic the Hedgehog 2 and Sonic the Hedgehog 3 functionality.</p><p>The game has been ported and digitally released on the <a href="/wii/3045-36/" data-ref-id="3045-36">Wii</a> (via <a href="/wii-shop/3045-87/" data-ref-id="3045-87">Wii Virtual Console</a> on September 9, 2009) and <a href="/xbox-360/3045-20/" data-ref-id="3045-20">Xbox 360</a> (via <a href="/xbox-live-marketplace/3045-86/" data-ref-id="3045-86">Xbox Live Arcade</a> on February 15, 2010). Both releases are programmed so that if the owner has downloaded this and any of the three Sonic games originally required for lock-on functionality, he/she can play that Sonic game as if it was going through the Sonic &amp; Knuckles lock-on technology.</p><h2>Gameplay</h2><figure data-ref-id="1300-257003" data-img-src="https://static.giantbomb.com/uploads/original/0/1264/257003-s_k_01.gif" data-size="small" data-align="right" data-embed-type="image" data-ratio="0.7"><a class="fluid-height" style="padding-bottom:70.0%" href="https://static.giantbomb.com/uploads/original/0/1264/257003-s_k_01.gif" data-ref-id="1300-257003"><img alt="No Caption Provided" src="data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==" sizes="(max-width: 320px) 100vw, 320px" data-width="320" class="js-lazy-load-image" data-src="https://www.giantbomb.com/a/uploads/original/0/1264/257003-s_k_01.gif" data-srcset="https://www.giantbomb.com/a/uploads/original/0/1264/257003-s_k_01.gif 320w"><noscript><img alt="No Caption Provided" src="https://www.giantbomb.com/a/uploads/original/0/1264/257003-s_k_01.gif" srcset="https://www.giantbomb.com/a/uploads/original/0/1264/257003-s_k_01.gif 320w" sizes="(max-width: 320px) 100vw, 320px" data-width="320"></noscript></a></figure><p>In Sonic &amp; Knuckles, players control either <a href="/sonic-the-hedgehog/3005-73/" data-ref-id="3005-73">Sonic the Hedgehog</a> or <a href="/knuckles/3005-204/" data-ref-id="3005-204">Knuckles the Echidna</a> as they navigate through 6-8 levels (known as "Zones", split into different "Acts") to track down <a href="/dr-robotnik/3005-293/" data-ref-id="3005-293">Dr. Robotnik</a> (in Sonic's campaign) or the lone <a href="/eggrobo/3005-23151/" data-ref-id="3005-23151">EggRobo</a> (in Knuckles's campaign). Players must dodge dangerous obstacles (such as spikes and bottomless pits) and plow through enemies (with attacks such as the rolling jump) to reach the end of each Act.</p><h3>Zones</h3><p>Like Sonic the Hedgehog 3, each main level (known as Zones) are split into two unique sections (known as Acts), each act with a unique setting (such as Sandopolis Zone starting out in the vast desert and ending up inside a haunted <a href="/pyramid/3035-1671/" data-ref-id="3035-1671">pyramid</a>) and music. The first act ends with one or more <a href="/mini-boss/3015-420/" data-ref-id="3015-420">mini-bosses</a> to fight and the second act ends with a <a href="/boss-fight/3015-50/" data-ref-id="3015-50">boss</a> to fight.</p><p>Hidden Palace Zone and Sky Sanctuary Zone have only one "act" and both serve as two "acts" to one "level". Both are heavily shortened and modified for Knuckles's campaign (the first as a simple transition and the second as the Knuckles's final boss battle). Death Egg Zone and Doomsday Zone cannot be played as Knuckles. Doomsday Zone can only be played as Super Sonic (or Hyper Sonic in Sonic 3 &amp; Knuckles) and has only one "act", serving as the Sonic's final boss battle.</p><p>In Sonic 3 &amp; Knuckles, all of the Sonic &amp; Knuckles levels appear immediately after all of the Sonic the Hedgehog 3 levels.</p><ul><li><b>Mushroom Hill Zone</b></li><li><b>Flying Battery Zone</b></li><li><b>Sandopolis Zone</b></li><li><b>Lava Reef Zone</b></li><li><b>Hidden Palace Zone</b></li><li><b>Sky Sanctuary Zone</b></li><li><b>Death Egg Zone</b> (Sonic Only)</li><li><b>Doomsday Zone</b> (Super/Hyper Sonic Only)</li></ul><h2>Lock-On Technology</h2><p>Using the game's special "lock-on technology", players can access special modes and features by putting any Sega Genesis cartridge on the cartridge's additional cartridge slot.</p><p>Booting up the game without any cartridge locked-on plays Sonic &amp; Knuckles normally. With most cartridges locked-on, the game shows up a special "No Way!" screen (in which players can play a secret random pre-generated Special Stage by pressing all buttons simultaneously).</p><p> </p><h3>Blue Sphere</h3><figure data-align="right" data-size="small" data-img-src="https://static.giantbomb.com/uploads/original/11/119300/2438878-sonicknuckles_noway.png" data-ref-id="1300-2438878" data-embed-type="image" data-ratio="0.75"><a class="fluid-height" style="padding-bottom:75.0%" href="https://static.giantbomb.com/uploads/original/11/119300/2438878-sonicknuckles_noway.png" data-ref-id="1300-2438878"><img alt="The screen that appears after locking on Sonic the Hedgehog." src="data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==" sizes="(max-width: 320px) 100vw, 320px" data-width="320" class="js-lazy-load-image" data-src="https://www.giantbomb.com/a/uploads/scale_small/11/119300/2438878-sonicknuckles_noway.png" data-srcset="https://www.giantbomb.com/a/uploads/original/11/119300/2438878-sonicknuckles_noway.png 640w, https://www.giantbomb.com/a/uploads/scale_medium/11/119300/2438878-sonicknuckles_noway.png 480w, https://www.giantbomb.com/a/uploads/scale_small/11/119300/2438878-sonicknuckles_noway.png 320w"><noscript><img alt="The screen that appears after locking on Sonic the Hedgehog." src="https://www.giantbomb.com/a/uploads/scale_small/11/119300/2438878-sonicknuckles_noway.png" srcset="https://www.giantbomb.com/a/uploads/original/11/119300/2438878-sonicknuckles_noway.png 640w, https://www.giantbomb.com/a/uploads/scale_medium/11/119300/2438878-sonicknuckles_noway.png 480w, https://www.giantbomb.com/a/uploads/scale_small/11/119300/2438878-sonicknuckles_noway.png 320w" sizes="(max-width: 320px) 100vw, 320px" data-width="320"></noscript></a><figcaption>The screen that appears after locking on Sonic the Hedgehog.</figcaption></figure><p>With <a href="/sonic-the-hedgehog/3030-2465/" data-ref-id="3030-2465">Sonic the Hedgehog</a> locked-on, one of the message in the "No Way!" screen changes to "No Way?" and pressing all buttons simultaneously unlocks a deeper Special Stage game (known as "Get Blue Spheres!" or, retroactively, as "Blue Sphere"). Players can play a series of pre-generated Special Stage levels (up to 134,217,728 configurations of varying difficulty) and keep track of their progress using a 12-digit numerical <a href="/password/3015-38/" data-ref-id="3015-38">password</a>.</p><p>Earning a "Perfect" in the stage (by collecting all possible rings) skips ahead 10 stages. Players start at level 1 and can change the password before entering the stage (including passwords given out after completing a Special Stage with any other cartridge).</p><p>There were plans to make Knuckles playable in Sonic the Hedgehog, but the concept was later scrapped because of issues with Knuckles's abilities in the game's levels.</p><p> </p><h3>Knuckles the Echidna in Sonic the Hedgehog 2</h3><figure data-align="right" data-img-src="https://static.giantbomb.com/uploads/original/3/30032/1139455-knuckles_in_sonic_2.jpg" data-ref-id="1300-1139455" data-size="small" data-embed-type="image" data-ratio="0.7423887587822"><a class="fluid-height" style="padding-bottom:74.2%" href="https://static.giantbomb.com/uploads/original/3/30032/1139455-knuckles_in_sonic_2.jpg" data-ref-id="1300-1139455"><img alt="Knuckles in Emerald Hill Zone, the first level of Sonic the Hedgehog 2." src="data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==" sizes="(max-width: 320px) 100vw, 320px" data-width="320" class="js-lazy-load-image" data-src="https://www.giantbomb.com/a/uploads/scale_small/3/30032/1139455-knuckles_in_sonic_2.jpg" data-srcset="https://www.giantbomb.com/a/uploads/original/3/30032/1139455-knuckles_in_sonic_2.jpg 854w, https://www.giantbomb.com/a/uploads/scale_medium/3/30032/1139455-knuckles_in_sonic_2.jpg 480w, https://www.giantbomb.com/a/uploads/scale_small/3/30032/1139455-knuckles_in_sonic_2.jpg 320w"><noscript><img alt="Knuckles in Emerald Hill Zone, the first level of Sonic the Hedgehog 2." src="https://www.giantbomb.com/a/uploads/scale_small/3/30032/1139455-knuckles_in_sonic_2.jpg" srcset="https://www.giantbomb.com/a/uploads/original/3/30032/1139455-knuckles_in_sonic_2.jpg 854w, https://www.giantbomb.com/a/uploads/scale_medium/3/30032/1139455-knuckles_in_sonic_2.jpg 480w, https://www.giantbomb.com/a/uploads/scale_small/3/30032/1139455-knuckles_in_sonic_2.jpg 320w" sizes="(max-width: 320px) 100vw, 320px" data-width="320"></noscript></a><figcaption>Knuckles in Emerald Hill Zone, the first level of Sonic the Hedgehog 2.</figcaption></figure><p>With <a href="/sonic-the-hedgehog-2/3030-1662/" data-ref-id="3030-1662">Sonic the Hedgehog 2</a> locked-on, players can play <em>Knuckles the Echidna in Sonic the Hedgehog 2</em>, in which they can play through the entirety of Sonic the Hedgehog 2 as Knuckles. Knuckles retains all of his abilities, and the game adds some new hidden items (that makes use of Knuckles's abilities). Two-player mode (including Time Trials mode) is disabled.</p><h3>Sonic 3 &amp; Knuckles</h3><figure data-align="right" data-size="small" data-img-src="https://static.giantbomb.com/uploads/original/11/119300/2438880-2438879-sonicknuckles_3.png" data-ref-id="1300-2438880" data-embed-type="image" data-ratio="0.703125"><a class="fluid-height" style="padding-bottom:70.3%" href="https://static.giantbomb.com/uploads/original/11/119300/2438880-2438879-sonicknuckles_3.png" data-ref-id="1300-2438880"><img alt="Knuckles in Angel Island Zone, the first level of Sonic the Hedgehog 3." src="data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==" sizes="(max-width: 320px) 100vw, 320px" data-width="320" class="js-lazy-load-image" data-src="https://www.giantbomb.com/a/uploads/scale_small/11/119300/2438880-2438879-sonicknuckles_3.png" data-srcset="https://www.giantbomb.com/a/uploads/original/11/119300/2438880-2438879-sonicknuckles_3.png 640w, https://www.giantbomb.com/a/uploads/scale_medium/11/119300/2438880-2438879-sonicknuckles_3.png 480w, https://www.giantbomb.com/a/uploads/scale_small/11/119300/2438880-2438879-sonicknuckles_3.png 320w"><noscript><img alt="Knuckles in Angel Island Zone, the first level of Sonic the Hedgehog 3." src="https://www.giantbomb.com/a/uploads/scale_small/11/119300/2438880-2438879-sonicknuckles_3.png" srcset="https://www.giantbomb.com/a/uploads/original/11/119300/2438880-2438879-sonicknuckles_3.png 640w, https://www.giantbomb.com/a/uploads/scale_medium/11/119300/2438880-2438879-sonicknuckles_3.png 480w, https://www.giantbomb.com/a/uploads/scale_small/11/119300/2438880-2438879-sonicknuckles_3.png 320w" sizes="(max-width: 320px) 100vw, 320px" data-width="320"></noscript></a><figcaption>Knuckles in Angel Island Zone, the first level of Sonic the Hedgehog 3.</figcaption></figure><p>With <a href="/sonic-the-hedgehog-3/3030-4628/" data-ref-id="3030-4628">Sonic the Hedgehog 3</a> locked-on, players can play <em>Sonic 3 &amp; Knuckles</em>, which combines both games into one "complete" game (with the Sonic the Hedgehog 3 campaign leading to the Sonic &amp; Knuckles campaign in one long story). With this setup, players can play the Sonic the Hedgehog 3 campaign as Knuckles (complete with branching paths, due to his abilities, and a harder EggRobo boss at the end of each zone), play through the Sonic &amp; Knuckles campaign as <a href="/tails/3005-45/" data-ref-id="3005-45">Tails</a> (or as Sonic with Tails), and save their progress in the Sonic &amp; Knuckles campaign (complete with more save slots).</p><p>In addition, players who reach the Sonic &amp; Knuckles campaign with all seven Chaos Emeralds can trade them for the ability to collect seven Super Emeralds (Chaos Emeralds powered-up by the Master Emerald). When they have all seven Super Emeralds, they can <a href="/super-form/3015-5834/" data-ref-id="3015-5834">transform</a> into Hyper Sonic (who, in addition to the abilities as Super Sonic, gains the ability to perform a mid-air dash that flashes the screen, clearing all enemies on the screen), Hyper Knuckles (who, in addition to the abilities as Super Knuckles, triggers a earthquake when clinging on to a wall, clearing all enemies on the screen), or Super Tails (who has the abilities of Super Sonic as well as being surrounded by four super-powered <a href="/flicky/3015-2749/" data-ref-id="3015-2749">Flickies</a> that automatically charge at enemies on the screen).</p>