The character select theme from Sonic Chaos is extremely similar to the song 'Lift' by 808 State.It is also similar to the opening theme for the TV show Full House (debuted September 1987) and Janet Jackson's hit single ' Together Again ' (released 1997). The earliest is the ' Maia Worzen ' theme from the video game Legacy of the Wizard ( Dragon Slayer IV), composed by Koshiro himself and released in July 1987. The 'Bridge Zone' theme from the 8-bit version of the game, composed by Yuzo Koshiro, sounds similar to several other songs.

The entire tune of Chemical Plant Zone sounds like a small portion of Prince's Glam Slam.

The boss theme in Sonic 2 (Game Gear version) sounds almost EXACTLY like 'Cubik' by 808 State.

The theme to Mystic Cave Zone sounds an awful lot like the opening theme to Inspector Gadget.

Metropolis Zone 's main riff is very similar to 'Loving You Sunday Morning' by Scorpions and Walk Idiot Walk by The Hives.

The Final Zone theme sounds similar to Duran Duran's 'Planet Earth'.

The A-section of the Scrap Brain Zone theme is a hybrid of the Blade Runner end titles theme by Vangelis and 'Metropolis' from Kraftwerk's The Man-Machine, while the B-section sounds like Kraftwerk's 'Spacelab' from the same album.

Parts of the music also sound similar to Madonna's Borderline, in particular the part at 00:17. In turn, it is the basis for the J-pop song Kusuriyubi no Kesshin by Dreams Come True, whom composer Masato Nakamura was a member of.

Star Light Zone's music is suspiciously similar to The Bee Gees' 'How Deep is Your Love' from Saturday Night Fever and Bobby Caldwell's 'Love Won't Wait'.

Labyrinth Zone is extremely similar to the song 'Best of My Love' by The Emotions.

Spring Yard Zone is pretty obviously inspired by Bobby Brown's 'Every Little Step'.

'The Hurt''s arpeggio (heard at 0:26) also turns up at 0:22 of 'Casino Night Zone 2Player' in Sonic 2.

Marble Zone sounds an awful lot like The Jacksons' 'The Hurt' as well as Andy Williams's 'Music to Watch Girls By'.

The opening melody of Green Hill Zone is remarkably similar to the chorus of Billy Joel's 'Big Shot'.

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