Sue D. (this is
really confusing!
), here is the section of Marita's walkthrough that tells about the telescopes: SPOILER
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Every ramp has a telescope while one ramp has two.
Each telescope is focused on a security gate on the ramp that circles the tower.
Use a telescope and see that the filters are placed on either side of the telescope.
Click on one or both filters and they will be placed over the lens.
The top button removes the filter while the lower button rotates the gate seen through the telescope.
Determine the correct red gate and rotate the gate so that the correct gate is farthest from the tower or situated at the outward part of the perimeter.
To know which gate is correct, place both filters over the telescope lens. The colors seen is the reverse of the correct one, so a blue gate is really the red gate and vice versa.
Rotate all blue colored gate to the outer side while both filters is over the telescope lens. Do this on all the telescopes.
When done, enter the tower and it will automatically go to the fifth floor.