Bust a Groove Codes, Unlockables and Secrets (PSX)

Bust-a-Groove is a hybrid music/fighting game for the Sony PlayStation released in 1998. The game was published by the Japanese video game maker Enix (now Square Enix) in Japan and brought to the U.S. by now-defunct 989 Studios. The original Japanese game was titled Bust A Move; the name was changed as the American release of Puzzle Bobble already used that name. The game combined PaRappa the Rapper-like rhythm-based gameplay with fighting game elements, including special moves designed to damage your opponent.

The sequel, Bust a Groove 2 (known as Bust A Move 2: Dance Tengoku Mix in Japan), unlike its predecessor, was never released in Europe. A third game in the series, Dance Summit 2001 was only released in Japan on the PlayStation 2. (Wikipedia)

Codes

Level skip
Complete the game once with any character then start a one player game. When the dance arena appears press Select + L2 - Level Skip

Unlockables

Dance Preview
To access an option which allows you to create your own dance routines, simply beat the game on Easy or above difficulty setting with the character that you wish to use for the dance preview.

Burger Dog - Complete the game on the Normal difficulty level with Hamm after acquiring Robo Z.

Capoeira - Complete the game on the Normal difficulty level with any character.

Columbo (Mouse) - Complete the game on the Normal difficulty setting with Shorty after acquiring Robo Z.

Dance View - Complete the game on the Normal difficulty setting.

Play as Robo-Z - Complete the game on the Normal difficulty level with any character after acquiring Capoeira.

Secrets

Alternate Characters
Highlight a character from the player select screen, hold Select and press X. You'll get that character's alternate costume.

Flat Characters
Pick Burger Dog or Hamm to play as, and do your special attack twice in a row.

Check out Kelly's stage right here: