Taiko No Tatsujin DS Oni mode
Successfully complete twenty songs to unlock the Oni difficulty setting.
Perfect mode
Successfully complete thirty songs. Then, go to the song selection screen, and press Down/Right to display the options. The Perfect mode icon resembles a yellow Don wearing a gold crown. In Perfect mode, one missed note will result in a failed song.
High-Speed 4
Successfully complete thirty songs. Then, go to the song selection screen, and press Down/Right to display the options. The High-Speed 4 mode icon resembles an animal with an open mouth with a red flag next to its name. In High-Speed 4 mode, notes will scroll four times as fast.
Unlocking songs quickly
To unlock songs normally, you must use the Daily Training Dojo once a day. To do this quickly, change the system date to the next day after you are done and repeat until all six songs are unlocked.