It has been discovered that Sonic CD, a classic 1991 video game for Sega Genesis, has a secret message that can be accessed by completing certain requirements.

The game’s hidden message was recently uncovered by by YouTuber “The8BitArcade” in a video he posted on July 10, 2018. The8BitArcade explains in the video that the message can be accessed by beating the game with all seven Chaos Emeralds, then accessing the game’s sound test and playing the song “Green Hill Zone – Act 1”.

When the song is played, a voice can be heard saying “You’re too slow!” in a mocking …