I want to make a mob drop trap with spawners in the Nether, and as it's the Nether I can't use water, so I want to have them spawn on one platform which retracts with pistons every so often. I tried to cover the area around the platform with cobblestone slabs, but the mobs were just spawning on the slabs. How do I make sure they spawn on that platform only (with the least amount of blocks)?
I recreated the platform with the spawners in a superflat world, the gold blocks represent the platform where the mobs should spawn:
Best Answer
To prevent Blazes spawning around the platform, you can do a few things:
Fill the area around with blocks, or
Fill the ground and adjacent walls with torches. Place them everywhere, on each block you can, except the platform and it's close surroundings
I'd recommend doing something in between - encasing the spawner and platform, and fill the area outside of the box with torches.
Good luck!