Sonic the Hedgehog Pocket Adventure (also known as Sonic Pocket Adventure) is a platform game developed by SNK and published by Sega for the Neo Geo Pocket Color in 1999. The game is based on Sonic the Hedgehog 2 (1992) for the Sega Genesis, borrowing much of the stage themes and gameplay elements, but featuring unique stage layouts, elements from other Genesis Sonic the Hedgehog games, and extra game modes. Sega's Yuji Naka and the rest of Sonic Team supervised over production. The game was released in December 1999 to positive reviews. Critics felt Sonic Pocket Adventure was a faithful adaptation of the traditional Sonic game formula, most importantly not making any sacrifices to the game's speed. Reviewers praised the game as one of the best among the Neo Geo Pocket Color's library and commended the quality of SNK's hardware. Several members of the SNK development team later formed Dimps which went on to develop several more Sonic games for handheld devices.