The mission sees Classic Sonic try to beat the red echidna to the finish in a Green Hill Zone level that contains giant badniks that you’ll have to bounce on to get by or reach higher platforms. German website GamesWelt has shared some Sonic Generations gameplay footage which gives us our first look at the Knuckles race mission. His appearance in this skin is based off his limited return appearance in the 2011 game 'Sonic Generations', in which the classic design returns with his current design for the hedgehog's 20th anniversary. The original Sonic the Hedgehog that appeared in games from his debut in 1991, up till 1998. Sonic Generations, Sonic Heroes, Sonic 2, Sonic 3 & Knuckles, Sonic Advance and Sonic Advance 2. With 3D entries overtaking the classic, more traditional hacks, last year, the following was decided. Sonic Generations Classic Sonic Physics.