Memo Deduction

Kill time & dig how your brain storming! You can choose different level to deductive out what color each memo has. Deductive out all the memos' color according to the hints 

Help:
Click each memo to select a color or leave blanks, click done;
Red pushpin numbers means the 'color & position are both right' numbers, the black means the 'color is right but position is wrong' ones.
Hint: The grey color=blank

3 levels chart:
Easy: 4 memos, 4 colors, 12 chances
Normal: 5 memos, 5 colors, 10 chances
Difficult: 5 memos, 6 colors, 8 chances