The team intended to add a two-player mode displayed via split-screen, but Naka's programming knowledge was insufficient to implement it. A two-player mode appeared in "Sonic the Hedgehog 2" (1992), whereby the second player controls Sonic's sidekick Miles "Tails" Prower. Sonic Team also intended to include a sound test with animations of Sonic breakdancing to a band of animal characters; including a crocodile keyboardist who was later introduced into the series as Vector the Crocodile in "Knuckles' Chaotix" in 1995. The sound test was scrapped for time reasons and Naka used the freed up memory to add the ""Se-ga!"" chant used in TV commercials as a startup sound.