What is the hardest song to play in Dance Revolution Extreme?

The hardest song to play on Dance Revolution Extreme is "MAX 300" by キャプテン★オズマ （Captain ★ Ozma）. It is a 10-foot chart with a BPM of 280. The song is known for its fast and complex steps, as well as its use of stop-and-go patterns and unexpected turns. It is considered one of the most challenging songs in the Dance Revolution series.