Dance Dance Revolution: Mario Mix

EX Story Mode:
Successfully complete Story mode.
Jordan Baptiste.

Hard Story mode:
Successfully complete Story mode under the normal difficulty setting.

Very Hard Story mode:
Successfully complete Hard Story mode.
.

Super Hard Story mode:
Successfully complete Very Hard Story mode.
vernanonix and Jordan Baptiste.

Extended Story mode:
In order to unlock the extended version of story mode, you must first complete normal story mode. It also lets you play the hard or very hard difficulty settings on extended mode.
TheGrantOne.

Super Hard songs:
In free mode, complete any song under Very Hard mode with a score of "C" or better to unlock Super Hard on that song.
NothngUpMySleeve.

While playing in Free mode, to unlock the Super Hard difficulty setting you must clear the song at the Very Hard Difficulty setting.
TheGrantOne.

Mini-games :
Play them in Story mode then complete Story mode with Mario or Luigi for different game for each character.
NothngUpMySleeve.

Flight of the S.S. Brass mini-game:
Successfully complete EX Story mode as Mario.
vernanonix.

Note Pickup mini-game:
Successfully complete EX Story mode as Luigi.
vernanonix.

Coin Collection mini-game:
Successfully complete EX Story mode.
vernanonix.

Treasure Boxes mini-game:
Successfully complete Story or EX Story mode as Mario.
vernanonix.

Whee! mini-game:
Successfully complete Story or EX Story mode as Luigi.
vernanonix.

Ten mini-games:
Successfully complete Story mode.
vernanonix.

Extra songs:
Play them in Story mode.
NothngUpMySleeve.

In order to unlock bonus songs, complete regular story mode, and while playing through the extended version you can purchase the song in the shops in each level except for level 5.
TheGrantOne.

Additional Free Play mode songs:
Successfully complete Story mode to unlock eighteen Free Play mode songs. Successfully complete EX Story mode to unlock six more Free mode songs.
vernanonix.

In order to unlock songs in Free play mode, you must dance that song during story mode.
TheGrantOne.

Choir song on the Green in Free mode:
Play EX Story mode. The song is now unlocked for purchase in the World 1 shop for 100 Coins.

Hop, Mario! Song in Free mode:
Play EX Story mode. The song is now unlocked for purchase in the World 2 shop for 200 Coins.

Where's the Exit? song in Free mode:
Play EX Story mode. The song is now unlocked for purchase in the World 3 shop for 300 Coins.

Piroli song in Free mode:
Play EX Story mode. The song is now unlocked for purchase in the World 4 shop for 400 Coins.