I got this on Stage 3. It seems slower paced. All you have to do is hit the notes well and add an extra note at the end
for example
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You want to hit the extra note on one of those white dots. If you hit the original notes and the extra notes on point you'll eventually hit cool mode. When you get there its a freestyle, so you can press whatever button combinations you want to maintain the cool mode. IT should pop up when it asks you to save your game.