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<p><strong><em>Sonic the Hedgehog</em></strong> is a [yadawiki link="video game"] series and [yadawiki link="media franchise"] created by Japanese developers [yadawiki link="Yuji Naka"], [yadawiki link="Naoto Ohshima"], and [yadawiki link="Hirokazu Yasuhara"] for [yadawiki link="Sega"]. It is the company’s flagship series and one of the most successful video game franchises of all time.</p>
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<p>The franchise follows [yadawiki link="Sonic the Hedgehog (character)" show="Sonic"], an anthropomorphic blue [yadawiki link="hedgehog"] with [yadawiki link="supersonic speed"], who battles the mad scientist [yadawiki link="Doctor Eggman"] and his armies of [yadawiki link="Badnik" show="robots"]. Eggman often seeks to conquer the world using his creations or the mystical [yadawiki link="Chaos Emeralds"], gemstones of infinite energy that grant machines and living beings immense power, including [yadawiki link="super transformation" show="super transformations"]. Sonic’s adventures can be seen as a blend of science fiction and fantasy, with Sonic portrayed as a free-spirited wanderer in contrast to Eggman’s ambition of becoming a global emperor.</p>
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<p>The franchise debuted on June 21, 1991 with <em>[yadawiki link="Sonic the Hedgehog (1991 video game)" show="Sonic the Hedgehog"]</em> for the [yadawiki link="Sega Genesis" show="Sega Genesis/Mega Drive"], created to rival Nintendo’s [yadawiki link="Super Mario" show="Mario"]. Its success made Sega a leading video game company during the early 1990s. Subsequent mainline entries were developed by [yadawiki link="Sega Technical Institute"], with spin-offs such as [yadawiki link="Sonic Spinball"]. Other titles were released for the [yadawiki link="Master System"] and [yadawiki link="Game Gear"]. After a hiatus during the [yadawiki link="Sega Saturn"], the first major 3D game, [yadawiki link="Sonic Adventure"], launched in 1998 for the [yadawiki link="Dreamcast"]. Following [yadawiki link="Sonic Adventure 2"] in 2001, Sega left the console market and shifted to third-party development, continuing the series on [yadawiki link="Nintendo"], [yadawiki link="Xbox"], and [yadawiki link="PlayStation"]. [yadawiki link="Takashi Iizuka"] has overseen the franchise as producer since 2010.</p>
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<p>Gameplay in the mainline entries emphasizes fast-paced [yadawiki link="platformer"] action with features such as slopes, springs, vertical loops, bottomless pits, and the franchise’s signature ring-based [yadawiki link="Health (game terminology)" show="health system"]. Levels often include iconic locales like [yadawiki link="Green Hill Zone"]. The design philosophy typically starts games easy before increasing in difficulty, appealing to players of all ages. Spin-offs cover [yadawiki link="Racing game" show="racing"], [yadawiki link="fighting game" show="fighting"], [yadawiki link="party game" show="party"], [yadawiki link="sports game" show="sports"], puzzle, and role-playing genres.</p>
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<p>Over time, Sonic has been joined by many allies and rivals, including [yadawiki link="Miles 'Tails' Prower"], [yadawiki link="Knuckles the Echidna"], [yadawiki link="Amy Rose"], [yadawiki link="Shadow the Hedgehog"], and [yadawiki link="Metal Sonic"], with several starring in their own spin-offs.</p>
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<p>The franchise also extends into other media, including [yadawiki link="List of Sonic the Hedgehog printed media" show="comics"] by Archie Comics, Fleetway, DC Comics, and IDW Publishing; [yadawiki link="List of Sonic the Hedgehog features" show="animated series"] produced by DiC Entertainment, TMS Entertainment, Genao Productions, and Netflix; a [yadawiki link="Sonic the Hedgehog (film series)" show="live-action film series"] by Paramount Pictures; and merchandise such as [yadawiki link="Lego Sonic the Hedgehog"] and other toy lines. Sonic has also crossed over into other franchises in games such as [yadawiki link="Mario & Sonic"], [yadawiki link="Sega All-Stars (series)" show="Sega All-Stars"], and [yadawiki link="Super Smash Bros."].</p>
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<p>As of 2025, franchise sales and mobile downloads have exceeded 1.77 billion worldwide, with over 166 million mainline games sold [ref][yadawiki link="Sega Sammy Holdings"], <a href="https://www.segasammy.co.jp/english/ir/library/pdf/printing_annual/2022/ir_2022_web_all_e.pdf" target="_blank" rel="noreferrer noopener">Integrated Reports 2022</a>, published October 13, 2022[/ref]. The original Genesis titles remain highly acclaimed and frequently appear on lists of the greatest of all time. Although later releases such as [yadawiki link="Sonic the Hedgehog (2006 video game)" show="Sonic the Hedgehog (2006)"], [yadawiki link="Shadow the Hedgehog (game)" show="Shadow the Hedgehog"], and [yadawiki link="Sonic and the Secret Rings"] received poor reviews, the series continues to influence the industry and is a mainstay of popular culture.</p>
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<p>The fandom is notable for its creativity, producing [yadawiki link="List of unofficial Sonic media" show="unofficial works"] such as fan art and fan games, keeping the series relevant and active beyond its official releases.</p>
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<h2 class="wp-block-heading">Overview</h2>
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<p>The mainline games in the series center around conflicts between the titular protagonist and namesake, [yadawiki link="Sonic the Hedgehog (character)" show="Sonic the Hedgehog"], and his arch-nemesis, [yadawiki link="Doctor Eggman" show="Dr. Ivo Robotnik"], better known as "Dr. Eggman". Sonic is a blue [yadawiki link="Hedgehog" show="hedgehog"] known for his carefree and cool attitude, capable of running at supersonic speeds and [yadawiki link="Spin Attack" show="curling into a ball"], allowing him to attack enemies.[ref name="TechnicalFiles"/][ref]Sonic Adventure Tokyo International Forum Unveiling Booklet — “All Star Cast,” p.6 (Aug 22, 1998).[/ref] Dr. Eggman is a [yadawiki link="Human" show="human"] mad scientist with an IQ of 300 who seeks to conquer the [yadawiki link="Earth" show="world"] to establish a totalitarian regime known as the "[yadawiki link="Eggman Empire"]" or "[yadawiki link="Eggmanland"]", where nature is replaced with machinery.[ref name="TechnicalFiles"/][ref]Sora Ltd. (Mar 9, 2008). ''[yadawiki link="Super Smash Bros. Brawl"]'' (Wii). Nintendo. Area/level: Trophy Hoard. “Eggman” trophy text.[/ref][ref]<a href="https://www.youtube.com/watch?v=XDe1b-NGjXk" target="_blank" rel="noreferrer noopener">Come Join the Eggman Empire!</a> (Sega, YouTube, Nov 2, 2017)[/ref] Being inspired by the culture of the 1990s, ''Sonic the Hedgehog'' incorporates environmental themes drawn from the era’s debates between developers and conservationists: Sonic represents “nature,” while Eggman embodies “machinery” and “development.”[ref]<a href="https://web.archive.org/web/19970605172353/www.sega.com/features/allsonic/creator/naka04.html" target="_blank" rel="noreferrer noopener">Interview with Yuji Naka: Creator of Sonic the Hedgehog</a> (Sega, archived Jun 5, 1997)[/ref]</p>
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<p>Central to the franchise are the [yadawiki link="Chaos Emerald"]s, seven gemstones of extraterrestrial origin possessing unlimited mystical power.[ref]“Sonic Adventure Production Presentation At Tokyo International Forum (1998)” (YouTube — ZedArchive, Apr 10, 2022), at 20:10.[/ref][ref]<a href="https://gamerant.com/sonic-frontiers-ancients-lore-explained-starfall-chaos-emeralds/" target="_blank" rel="noreferrer noopener">Sonic Frontiers: What Are the Ancients?</a> (Game Rant, Nov 9, 2022)[/ref] They can convert thought into energy, warp time and space through [yadawiki link="Chaos Control"],[ref]Sonic Team; Blindlight (Nov 24, 2006). ''[yadawiki link="Sonic the Hedgehog (2006 video game)" show="Sonic the Hedgehog (2006)"]'' (Xbox 360). Sega — “Shadow the Hedgehog” episode: “With a Chaos Emerald, I control time and space.”[/ref] energize living beings, and serve as power sources for weapons of mass destruction.[ref]''[yadawiki link="Sonic the Hedgehog (1991 video game)" show="Sonic the Hedgehog (1991)"]'' manual (Mega Drive, JP), pp. 4–5 — Chaos Emeralds description.[/ref] Eggman often seeks them to achieve world domination, while Sonic and his allies prevent their misuse. When all seven Emeralds are gathered, they enable a "[yadawiki link="Super transformation"]", granting near invincibility and amplified abilities.[ref name="TechnicalFiles"/]</p>
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<p>The series features a large and evolving cast. ''[yadawiki link="Sonic the Hedgehog 2"]'' (1992) introduced [yadawiki link="Miles Prower" show="Miles “Tails” Prower"], a mechanical genius from [yadawiki link="West Side Island"] and Sonic’s best friend. ''[yadawiki link="Sonic the Hedgehog CD" show="Sonic CD"]'' (1993) added [yadawiki link="Amy Rose"], a cheerful pink hedgehog who wields her signature [yadawiki link="Piko Piko Hammer"], and [yadawiki link="Metal Sonic"], a robotic duplicate created by Eggman. ''[yadawiki link="Sonic the Hedgehog 3"]'' (1994) introduced [yadawiki link="Knuckles the Echidna"], the guardian of the [yadawiki link="Master Emerald"] on [yadawiki link="Angel Island (Sonic the Hedgehog)" show="Angel Island"], which stabilizes the Chaos Emeralds’ power. ''[yadawiki link="Knuckles' Chaotix"]'' (1995) featured [yadawiki link="Team Chaotix"], composed of [yadawiki link="Vector the Crocodile"], [yadawiki link="Espio the Chameleon"], and [yadawiki link="Charmy Bee"]. Other classic-era characters include [yadawiki link="Mighty the Armadillo"], [yadawiki link="Ray the Flying Squirrel"], and [yadawiki link="Fang the Hunter" show="Fang the Sniper"], who later reappeared in ''[yadawiki link="Sonic Mania"]'' and ''[yadawiki link="Sonic Superstars" show="Sonic Superstars"]''.[ref]<a href="https://venturebeat.com/games/sonic-superstars-wants-to-give-fans-a-classic-2d-game-with-new-surprises/" target="_blank" rel="noreferrer noopener">Sonic Superstars wants to give fans a classic 2D game with new surprises</a> (VentureBeat, Jun 10, 2023)[/ref]</p>
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<p>With ''[yadawiki link="Sonic Adventure"]'' (1998), [yadawiki link="Sonic Team"] transitioned the series into 3D, redesigning the characters with longer limbs and modernized proportions to suit the new perspective.[ref]<a href="https://www.polygon.com/features/2017/4/17/15099400/how-sega-moved-sonic-from-2d-to-3d" target="_blank" rel="noreferrer noopener">How Sega moved Sonic from 2D to 3D</a> (Cook & Becker via Polygon, Apr 17, 2017)[/ref] The older look was later labeled “Classic” and the newer as “Modern” in ''[yadawiki link="Sonic Generations"]'' (2011). Subsequent entries expanded the cast further, introducing characters such as [yadawiki link="Big the Cat"], [yadawiki link="Chaos (Sonic the Hedgehog)" show="Chaos"], [yadawiki link="Shadow the Hedgehog (character)" show="Shadow the Hedgehog"], [yadawiki link="Rouge the Bat"], [yadawiki link="Cream the Rabbit"], [yadawiki link="E-123 Omega"], [yadawiki link="Blaze the Cat"], the [yadawiki link="Babylon Rogues"], [yadawiki link="Silver the Hedgehog"], and [yadawiki link="Sage (Sonic the Hedgehog)" show="Sage"]. Many of these characters have starred in their own spin-offs, including ''[yadawiki link="Dr. Robotnik's Mean Bean Machine"]'', ''[yadawiki link="Knuckles' Chaotix"]'', ''[yadawiki link="Tails Adventure"]'', and ''[yadawiki link="Shadow the Hedgehog (video game)"]''.</p>
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<p>Two-dimensional ''Sonic'' titles are [yadawiki link="Platform game" show="side-scrolling platformers"] characterized by speed, momentum, and environmental interaction. Golden [yadawiki link="Ring"]s serve as the series’ unique [yadawiki link="Health (game terminology)" show="health system"], protecting the player from damage and granting extra lives. Levels, known as [yadawiki link="Zone"]s, feature slopes, loops, springs, and hazards such as [yadawiki link="Spikes (Sonic)" show="spikes"] and [yadawiki link="Bottomless pit" show="bottomless pits"]. Checkpoints like [yadawiki link="Star Post"]s mark progress, while [yadawiki link="Special Stage"]s and [yadawiki link="Bonus Stage"]s reward skilled play with extra lives or Chaos Emeralds. Enemies, called [yadawiki link="Badnik"]s, are robots built by Eggman and can be defeated by [yadawiki link="Spin Jump" show="jumping or rolling into them"].</p>
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<p>Three-dimensional entries retain these mechanics while adding freer movement, more cinematic sequences, and greater emphasis on story and character development.</p>
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<h2 class="wp-block-heading">History</h2>
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<h2 class="wp-block-heading">Notes</h2>
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<p>[notelist]</p>
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<h2 class="wp-block-heading">References</h2>
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<p>[reflist]</p>
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<p></p>
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