In celebration of the recently revealed Sonic x Shadow Generations, a new costume based on Shadow the Hedgehog is being added to Sonic Superstars. Sonic Superstars launched last year, giving fans a new 2D adventure based on the 16-bit Sega Genesis games. Post-Superstars' release, Sega has been adding free DLC costumes for its playable characters, such as a holiday-themed Sonic costume. The next costume will be added later this month.