Terraria One Way Floor

A one way wall can be created when 1 or more stair platforms are placed vertically on any block s.
Terraria one way floor. Enemies must be pathing toward a target that is below them in order to use this hoik. I m working on a mob trap like the one shown here but the slime just jumps out. 2 basic circuit designs for one way doors one that opens the door from a separate input or one that merely allows you to leave whenever you please. I have decided to make a one way trapdoor so that monsters can fall down into it but it can t jump out.
The one way can be used by any entity the player must press the down key when walking through the one way for the effect to work. Please note i do not want farming techniques i know this isn t the best i just want to know how to make a one way vertical gate. We are able to give an optimized no lag experience that you will be able to enjoy.