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Sonic The Hedgehog 2 is a classic side-scrolling platform video game developed and published by Sega for the Sega Game Gear in 1992. It is the sequel to the original Sonic The Hedgehog, released on the same console. The game follows Sonic, an anthropomorphic blue hedgehog as he attempts to save his animal friends from the evil Dr. Robotnik, who has kidnapped them and turned them into robotic slaves.

The player controls Sonic in a two-dimensional world filled with obstacles, enemies, and power-ups. To progress through the levels, Sonic must collect rings scattered throughout each stage while avoiding enemy attacks and obstacles. As with its predecessor, Sonic can also use special abilities such as rolling into a ball or performing a spin attack to defeat enemies or break barriers.

The game contains eight levels divided into four zones: Emerald Hill Zone, Chemical Plant Zone, Aquatic Ruin Zone and Casino Night Zone. Each zone contains three stages plus a boss stage at the end of each zone where Sonic must face off against one of Dr. Robotnik's mechanical creations. After completing all four zones and defeating Dr Robotnik's final creation – the Death Egg – Sonic will be rewarded with an ending cutscene showing him saving his friends from captivity.

Unlike its predecessor which had only one playable character - Sonic - this game introduces Tails - a yellow fox with two tails - as Sonic's sidekick who can fly for short periods of time using his tails as propellers. Despite being unable to collect rings like Sonic can, Tails is still able to help out by attacking enemies from behind or carrying objects that are too heavy for Sonic to lift on his own.

Sonic The Hedgehog 2 for the Sega Game Gear was generally well received by critics upon release; praised for its improved graphics over its predecessor and fast-paced gameplay that kept players engaged throughout the adventure. It has since become one of the most beloved titles in Sega's library and is considered to be one of the best games available on the system.