Dooors 2 Level 12 is a bit tricky, you will see a small hatch on the right side of the door, tap and open it, you will see three green lights as shown in the screenshot below.
Tap on each color to change to blue, grey and green as they form the center of the spectrum that is shown on the right side of the door.
Now Tap to open the door and move to the next level.
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