When Doom was released in 1993 it was an undeniable boon to the game modding community, and among the many fan projects built on its bones was Sonic Robo Blast 2. Its slippery physics recalled the most celebrated Sonic titles and Doomguy's inhumanly fast movement meshed perfectly with a a franchise all about speed. Development first began in 1998, and hasn't really stopped since. Unlike many of Doom's dusty one-off level mods, SRB's most recent patch came in May of this year. After almost two decades, the game isn't just surviving -- it's thriving.