The talking pie needs your help! Complete the first 14 levels in Chronotron to unlock the Sharpening Stone card.
The Baby Got Back to the Future Challenge was a challenge for the game Chronotron that was released on May 8th, 2008 and lasted until May 15th, 2008. To complete it, the player had to complete the first 14 levels. Completing the challenge would give the player the Replay 1 version of the Sharpening Stone card.