Best way to get the hard 5000000 score badge is to first complete the game so that you can choose any of the options. Then you select the settings that would help you reach the goal easiest. These settings are:
1) Song Letting go (you have to to get the badge)
2) Shapes - Floral (they are the largest)
3) Pattern - Straight (easier to predict and catch)
4) Motion - Fixed (also easier to predict and catch)
5) Randomize - off.
Apply normal tactics when playing (catch as many yellow as possible) and you'll be set.
Up-vote so others can see it! :-)
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