Sonic Robo Blast 2 (often abbreviated SRB2) is a platform game made within id Software's Doom engine. It is a free Sonic the Hedgehog fan game inspired by the original Sega Genesis games that "attempts to recreate their design in 3D", and was the first fan-made 3D Sonic game created. The game has received consistent support throughout its development of over 25 years, which has been attributed to a large modding community. The game's predecessor, Sonic the Hedgehog Robo-blast!, bears little resemblance to Sonic Robo Blast 2, and was released on February 11, 1998.[9] Sonic Robo Blast 2 started development later on in 1998, and has received updates since then, culminating in the release of version 2.2 in 2019. As of July 2026, its development is ongoingC