Making a fake slope
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Only possible in ZDoom and other source ports that support ZDoom-style slopes.
Create 2 sectors. One that is at the bottom of the hill and one that is the hill. Make the linedef in the middle of the two face up the side of the hill. Make it type 181. Change the arguments "floor" and "ceiling" to 1. Next raise the floor and lower the roof of the sectors by 16 units. This should create a slope.
