Rhythm Paradise

Reach a high level on a stage to unlock a medal. After earning a medal, the icon of the stage will have a gold border.

Earn a medal on all fifty songs. There will no longer be any pauses between Perfect challenges.

North America
Get four medals to unlock the telephone mini-game in "Rhythm Toys". Dial the following codes during the telephone mini-game to get a hidden song from Rhythm Tengoku on the Game Boy Advance. Note: The codes can be found at various hidden locations.

Dial 5553282338 (found in Business Card under "Rhythm Toys"; requires 1 medal).
Dial 5557325937 (found in Tunnel Endless; requires 12 medals).
Dial 5557268724 (found in Samurai Slice Endless; requires 17 medals).
Dial 5557625688 (found in Battle Of The Bands; unlocked by completing all 50 stages).

Japan
Get four medals to unlock the telephone mini-game in "Rhythm Toys". Dial the following codes during the telephone mini-game to get a hidden song from Rhythm Tengoku on the Game Boy Advance. Note: The codes can be found at various hidden locations.

Dial 831[Music Note]831[Music Note]831[Music Note] (found in Business Card under "Rhythm Toys"; requires 1 medal).
Dial 2[Music Note]21[Music Note]98 (found in Tunnel Endless; requires 12 medals).
Dial 246936[Music Note]1 (found in Samurai Endless; requires 17 medals).
Dial 44[Music Note]8231[Music Note] (found in Live Contest; unlocked by completing all 50 stages).

To get a Perfect on a song, you MUST wait until it has been chosen as a Perfect-eligible song which happens at random times (you'll know this when the frame for the stage changes and becomes wider and more colourful), otherwise your Perfect will not count. You have 3 attempts at getting a Perfect before its eligibility ceases, where it will either disappear for a while or change to a different stage. Note: You can attempt a Perfect on a stage even if you've failed the initial 3 attempts, but you must wait again until it is chosen as Perfect-eligible.

Hit The "O" on Menu And Hit Rhythm Toys