C1 Piston

AKA Engine/Engine Piston/Crusher, this effect causes the ceiling to lower and raise itself repeatedly. I call it a Piston because it's only one word, and because it's easier to form an image in your mind of a Piston than an "Engine".

Create the piston sector.

Place the following sprites in the piston sector: S[0,25] (Sp[0,Speed]). The vertical position of the S determines the piston's initial vertical position (I usually just leave it on the floor).

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