Sonic Labyrinth is a 2D isometric platformer developed and published by Sega for the Sega Game Gear in October 1995 (in Europe) and November 1995 (worldwide).
A spin-off of the Sonic the Hedgehog series, Sonic Labyrinth puts the titular hedgehog in bumper-filled mazes (similar to pinball tables) as he navigates each maze to find all keys and reach the exit before the timer expires. However, Dr. Robotnik has secretly replaced his trademark shoes with "slow-down boots", negating his ability to run fast and jump and making him unable to remove the boots without energy from chaos emeralds. He can still use his Spin Dash ability to quickly navigate each maze.
It was included as a hidden mini-game in the 2003 game Sonic Adventure DX: Director's Cut, in the 2004 compilation Sonic Mega Collection Plus, and in the 2005 compilation Sonic Gems Collection (as a limited "demo"). It was also digitally re-released for the Nintendo 3DS (via Virtual Console) on May 2012 (in Japan and Europe) and June 2013 (in North America).