On April 21, 2012, an early beta version was accidentally released to people who pre-ordered the game on the digital retailer Steam before Sega removed it.
This game was going to have a Episode 3 which was going to be starring by Knuckles the Echidna, unfortunately the episode 3 was canceled due to the reception of the Episode 1 and 2 and this Episode 3 is considered lost media because no other information like the artwork, details etc was never mention by Sega and Sonic Team