Doors and Floors Level 19 Walkthrough:
Look at the roman numerals on the left CMXLII = 942 and on the right DXVIII = 518. The boxes on the door are numbered from 1 to 9, top to bottom.
Tap box #9, 4, and 2 on the left column of boxes on the door.
Tap box # 5, 1, and 8 on the right column of boxes on the door.
Proceed to the next Doors and Floors level!
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