Master level difficulty
To unlock as master difficulty, get an A in one of the tracks. You will then have a new difficulty level. It is (as far as I can tell) exactly like hard mode but with less warning when the heads will appear
Unlockable How to Unlock Master level Get A rating in hard mode in track
Contributed By: reddragonflame.
Songs 23-28 (NTSC Version)
The PAL (European) version has 25 songs total, while the US version has 28.
Unlockable How to Unlock Songs 23-28 (US version only) Complete the first 23 songs on any difficulty.
Contributed By: mdude4.
Unlocking tracks 21-25
Unlockable How to Unlock Track 21-25 Complete tracks 1-20 all the way through on any mode.
Contributed By: samisanetgeek.
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