They updated the world 8 and I realized it is missing in the walkthrough. So here is the solution if you guys are stuck.
World 8 Main Stage
World 8-1
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World 8-2
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World 8-3
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World 8-4
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World 8-5
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World 8-6
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World 8-7
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World 8-8
World 8 Bonus Stage
World 8-1A
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World 8-2A
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World 8-2B
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World 8-3A
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World 8-4A
I have no idea how to arrange them so it goes through the green barrier.
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World 8-4B
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World 8-5A
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World 8-5B
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World 8-6A
The only stage that gives you so many tracks for no reason. Get your achievement here.
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World 8-7A
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World 8-8A
Thanks to Zaxia Li for his great guide, all credit to his effort. you can also read the original guide from Steam Community. enjoy the game.
