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I think this needs clarification on a few things: Do skulls count towards color bonus, or block bonus?
If I recall correctly, they do not count toward either.
To get out of the first tutorial wood league, simply drop the colors in the column that they correspond to. Put color 0 in column 0, color 1 in column 1, etc. You will have to read in all the colors and store them in an array as opposed to using the default code.