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: 10 The game ends prematurely when all lives are lost, although the player can return to the beginning of the current act if they have any continues.
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The player starts the game with three lives : 12 and will lose one if they are hit without carrying any rings, drown, fall into a bottomless pit, or reach the act's 10-minute time limit. Like the original, Sonic collects rings, which protect him from being hit by an enemy or obstacle. The player jumps between platforms, avoids enemy and inanimate obstacles, and breaks televisions to collect shields, speed shoes, and invincibility, and mark checkpoints. As in the original, the anthropomorphic hedgehog Sonic ventures to rescue the animal population of South Island from the diabolical Doctor Robotnik, who plots to turn them into robots. The 8-bit Sonic the Hedgehog is a side-scrolling platform game similar in gameplay and style to the original 16-bit Sega Genesis game of the same name, save for several new and altered game mechanics. Sonic, the player-controlled character, fights Doctor Robotnik in Bridge Zone, the game's second level. It was also Ancient's first game and the only Sonic game they developed. It received several sequels, beginning with Sonic the Hedgehog 2 in 1992.
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The 8-bit Sonic has been rereleased through Sonic game compilations and Nintendo's Virtual Console. Game journalists retrospectively considered it one of the best Game Gear and Master System games. Many believed that it compared favorably to its 16-bit counterpart, although some criticism was directed at its low difficulty and short length. Reviewers acclaimed the 8-bit Sonic for its level variety, visuals, gameplay, and audio. It also features a different soundtrack from Koshiro, which comprises new material alongside some rearrangements of Masato Nakamura's tracks for the 16-bit game. While some level themes, such as Green Hill Zone, are borrowed from the 16-bit game, others are original. Gameplay is similar, Sonic collects rings while avoiding obstacles, but is paced extremely slower as the 8-bit version focuses more on exploration. The premise and story of the 8-bit Sonic are identical to that of the 16-bit game: as the anthropomorphic hedgehog Sonic, the player races through levels to rescue the imprisoned animals Doctor Robotnik plots to turn into robots. The 8-bit Sonic is a side-scrolling video game similar in style to the 16-bit game, but reduced in complexity to fit the 8-bit systems. Ancient-a studio founded by composer Yuzo Koshiro for the project-developed the game and Sega published it to promote the handheld Game Gear. It is a companion to the 16-bit Sega Genesis game Sonic the Hedgehog for the 8-bit Master System and Game Gear consoles. Sonic the Hedgehog is a 1991 side-scrolling platform game.
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