This one is a little tricky to open. You have to set each square in the right color by tapping it. Beside each square, on the door, the number of lines indicate the color:
1 stick will indicate color red
2 sticks will indicate color green
3 sticks will indicate color blue.
From the top of the door to the bottom, the left squares on the door should color : GREEN, RED, RED
From top to bottom , the right squares should color : RED , BLUE , GREEN.
Thats it, the door should open.100 doors – walkthrough level/door 17,