100 Doors 2013 Walkthrough levels 36

100 Doors 2013 Level 36 solution:

This level was rather tricky.
The numbers above the door points to row/column combinations.
1 | 4 = Column 1, Row 4 = 5 | 0
2 | 3 = Column 2, Row 3 = 0 | 6
4 | 3 = Column 4, Row 3 = 7 | 3 | 0
2 | 1 = Column 2, Row 1 = 2 | 0
3 | 3 = Column 3, Row 3 = 0 | 5

Now look at the 4 clocks, each clock has a white button.  The white button points in the direction of the Zero in the equations.

Clock 1 (top left), the button is at the bottom.  Equations = 7| 3 | 0; 2 | 0
Clock 2 (top right), the button is at the top.  Equation = 0 | 5
Clock 3 (bottom left), the button is at the left.  Equation = 0 | 6
Clock 4 (bottom right), the button is at the right.  Equation = 5 | 0

TO exit:

Tap clock 4, 5 times.

Tap clock 3, 6 times.

Tap clock 1, 12 times (7 + 3 + 2 = 12)

Tap clock 2, 5 times.