Sonic the Hedgehog: Triple Trouble (Sonic & Tails 2 in Japan) is a platform video game in the Sonic the Hedgehog series, for the Sega Game Gear. It was developed by Aspect and published by Sega in 1994. It is the sequel to Sonic Chaos, which was the first Sonic & Tails game in Japan. The game received mixed to positive reception, with reviewers praising it as one of the few games that came close to replicating the quality of the Sonic games for the Sega Genesis, but noting that it was still hindered by the technical limitations of the Game Gear. Sonic the Hedgehog: Triple Trouble was re-released on the 3DS eShop on March 15, 2012 in North America.

While the first few Sonic games for the Game Gear were simply ports of the Sega Master System versions, and lacked some of the elements found in the Sega Genesis games, this Game Gear-exclusive game was much larger in size than its predecessors. Gameplay gave an experience very much in keeping with the Sonic games of the Genesis.

This is the first Sonic game in which the player does not lose all of his or her rings after getting hurt. Touching spikes will take away 50 rings. Any other type of hit will take away 30 rings.

The choice is given of playing as either Sonic or Tails. Sonic has the ability to do the Strike Dash/Super Peel Out (from Sonic CD) that gives him a speed burst and temporary invincibility. Tails has the ability of flight in this game. The enemies are Dr. Robotnik, Knuckles and the new character Nack the Weasel, who only appears in the Special Stages to keep aside the Chaos Emeralds. Special Stages are entered by finding an Emerald item box after collecting 50 rings. They involve completing a task, such as navigating an obstacle course or a minigame, before fighting against Nack for the Emerald.

This is the first Sonic game to feature spring maneuvers. After bouncing off of a spring, when the character is usually vulnerable, Sonic and Tails can now use the "Flying Spin Attack", allowing the character to roll into a ball for a brief moment to defend themselves. This maneuver is essential to some parts of the game, such as the first boss battle. Tails can alternatively begin flight, but he cannot fly upwards. This gameplay idea would not appear in the series again until Amy Rose was playable in Sonic Advance with her hammer swing.

There are six Zones, each with three Acts: Great Turquoise, Sunset Park, Meta Junglira, Robotnik Winter, Tidal Plant and Atomic Destroyer. The third Act is merely a short course (with a small cache of Rings to pick up) followed by a boss, one of Robotnik's powerful robot creations. The doctor himself is not seen until the final stage.

Keeping with tradition, there are five unique Special Stages to access in the game. By collecting 50 rings and breaking open the "Chaos Emerald" item box, a portal appears which leads to the Special Stage. The first, third and fifth stages are giant mazes with a countdown timer. The timer can be boosted with "Stopwatch" item boxes scattered throughout, but it never exceeds one and a half minutes. The second and fourth Special Stages involve flying the Tornado aeroplane to collect rings and avoid bombs. At the end of every Special Stage, Nack shows up and attacks to protect the Chaos Emerald.