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From the examples you typed I would say you have some qoute misplacements, but seeing as they are typed over, there is really no way of saying ... anyways
Things I see typed wrong:
[quote:35dsnw9t]On Start of Layout: Local Key "Highscore" Exist - Set "Highscore" to int(WebStorage.LocalValue(Highscore))
the bold part should be
int(WebStorage.LocalValue("Highscore"))
Highscore should passed as a string which references the name of the variable in web storage.
Without qoute, it will try to use the Highscore value (likely a number) as a name to reference the web storage variable.
and
[quote:35dsnw9t]Score > "Highscore" Set Local key "Highscore to "Score"
the bold part should be
Score
Beacuse::
Score is a variable, if you place it between qoutes it becomes the string "Score" and not a variable.