Jump on the button in the lefthand corner and watch the blinking pattern once it stops repeat the pattern with Zed to open the door.
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You Complete The Levels
Left at 11 Right at 7
With the help of Sgt. Johnson kill all the aliens. Reach 20 kills to complete the level.
It doesn't exist. There is no way to the penthouse, or rather, complete level 7.
This level is not possible to complete.