how to unlock in hard??? i have all but tail light sonata... i make a good score but no unlock??? tyvm 4 your answer !!! do i have to hit 100% ???

What's an artifice?
I don't understand your question, I'm sorry.

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If you talk about the special firework related to a tune.

You have to explode the correct bomb (you will notice it has it has a different trail going up)
And you have to complete the tune (rating is not important)