Songs - The PlayStation 2 version includes 101 songs.
Difficulty Levels - There are 5 levels. NORMAL, HARD, CRAZY, FREESTYLE, and NIGHTMARE. Note: FREESTYLE and NIGHTMARE are one player, two mat modes. Two Player Mode is available in NORMAL, HARD, and CRAZY.
Modifiers - Modifiers allow you to change how the game is played. There are twelve kinds of modifiers including hidden modifiers.Example of Modifiers:
Velocity (Arrow speed will increase by 2, 3, 4 or 8 times.)
Mirror (Arrows are displayed backwards. It will be useful, if you are performing with your back to the screen for an audience.)
Vanish (Arrows will disappear halfway up the screen.).
Unlock System - Some songs, modes and modifiers are either locked or hidden.
Internet Rankings: Do well in the game and you get a 16 digit code so you can register the score online and compete with players all over the world.
Bigger Music Selection: PIU features more music and a wider selection of music to choose from than other dance games. Included are popular dance tracks from Grammy nominees Crystal Method and Steriogram, Elvis vs Junkie XL, Sugarhill Gang and Earth, Wind, and Fire. Additionally, there is a large selection of K-Pop (Korean Pop) songs featuring well-known Korean acts like BoA and CLON, Latin music, and music from the Pump It Up 'house' band, Banya.
The game offers one player, one mat modes, two players two mat modes, and uniquely, one player two mat modes.