Blocks & Decoration Idea for Lava pit farming and/or adventure maps

[Luk304]

I was sitting in my house on Terraria the other day mob farming with lava pits and I thought "Wouldn't it be cool if there was a block that could be entered one way like a door and then the other sides would act like walls. Kinda like the blocks in Mario Maker that can only be entered one way. Just thought i'd share this idea of mine as this could be used for lava farms to make the pits smaller or even for adventure maps.

 

[Mihn]

I was sitting in my house on Terraria the other day mob farming with lava pits and I thought "Wouldn't it be cool if there was a block that could be entered one way like a door and then the other sides would act like walls. Kinda like the blocks in Mario Maker that can only be entered one way. Just thought i'd share this idea of mine as this could be used for lava farms to make the pits smaller or even for adventure maps.

You can always do this via actuators, or hoik.