100 Rooms Level 28 Walkthrough

1. In this level, you have to make the correct color to open the door.
Start by going to the table with glass beakers.

2. Pick up as many as you can. You'll need more after you run out so just come back when you need it (need 18 total).

3. Go to the color machine. Combine colors in this order (Press the glass beaker to the red, blue, or yellow spout in the machine to get the color):
red + blue = green + yellow = sky blue + red = purple
red + blue = green + yellow = sky blue
purple + sky blue = black
red + blue = green + yellow = sky blue + red = purple
black + purple = white
red + blue = green + yellow = sky blue + red = purple
red + blue = green + yellow = sky blue
purple + sky blue = black

4. Now with a white bottle and black bottle:
white + black = mystery mixture (key to door) 

5. Go to the door and use the mixture on the lock.

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6. Proceed to the next level!