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Sonic The Hedgehog is a classic side-scrolling platform video game released by Sega in 1991. It stars Sonic, a blue hedgehog with super speed who must save the world from the evil Dr. Robotnik and his robotic minions. Sonic The Hedgehog was one of the most successful and influential video games of all time, selling over 15 million copies worldwide across multiple platforms.

The game takes place on Planet Mobius, a colorful and vibrant world filled with forests, deserts, mountains, and other scenic landscapes. Players take control of Sonic as he navigates through each level while collecting rings and avoiding obstacles like spikes, bottomless pits, and enemies. As players progress through the levels they will encounter Dr. Robotnik's robots which must be defeated in order to advance further into the game. There are also secret paths that can be found by using special power-ups or hidden items that provide access to bonus stages where additional rewards can be earned.

Throughout the course of the game players must battle their way through six different zones consisting of three acts each before reaching Dr. Robotnik's fortress in order to defeat him and save Planet Mobius from his evil plans. Each zone has its own unique theme such as Green Hill Zone which is filled with lush greenery or Chemical Plant Zone which has pools of toxic waste that need to be navigated carefully in order to progress. Along the way there are various power-ups such as shields that allow Sonic to take an extra hit from enemies or invincibility stars that make him temporarily invincible against any harm.

Sonic The Hedgehog was released for both Sega Genesis/Mega Drive consoles as well as for portable gaming device called Sega Game Gear. On Game Gear it featured a smaller screen size than its console counterparts but still retained its vibrant graphics and smooth gameplay mechanics despite being on a handheld system. This version also added new features such as a password system which allowed players to continue their progress from where they left off if their battery ran out during playtime or if they wanted to jump back into an earlier stage without having to start all over again from scratch.

Overall Sonic The Hedgehog is an excellent example of what classic side-scrolling platformers were like during the early days of gaming history. With its colorful visuals, catchy soundtrack, memorable characters, challenging levels, and unique power-ups it remains one of the most iconic titles ever released for Sega’s consoles and handheld systems alike even after nearly three decades since it first debuted in 1991!