DDRMAX2: Dance Dance Revolution Tips
DDR Max 2 uses a unique "point system" to reward you with hidden content (new songs, options, etc.) Every song you clear regardless of difficulty level, including Nonstop mode songs, counts as 1 point. Every 5 points you earn unlocks a new item. So by setting "Max Stage" in Options to 5 and then clearing that many stages each time you play Game Mode, or clearing a Nonstop course with at least 5 songs, you can unlock at least one new item every time you play.