The adventure continues and the porting of Kitty Scratch 2 from iOS to Android is almost done. 
I want to write here the 4th main steps that we faced during this debugging process, as reminder for future videogames:
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Nothing works and nobody knows why (- -)
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Nothing works and somebody knows why (- +)
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Everything works and nobody knows why (+ -)
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Everything works and everybody is happy (+ +)