This question already has an answer here:
- What is wrong with my mob spawner? 7 answers
I built (by following tutorials, see below) a Mob Grinder. It's a simple 20x20, with water, etc.
But when I go up there, it's not dark inside. I don't use Gammabright and I didn't put torches or anything.
I went to have dinner and put hoppers in the ground and stood 1 block away from the spawner, to see if some mob spawn and falls. But I got just 5 bones, 2 strings, 1 gunpowder and 4 rotten flesh, which is far less spawns than in the video.
I'm playing on multiplayer, but I'm very far away from other players. I saw in other topics, that we need to stop the mob spawning in the area around me, then they will get more chances to spawn in my trap, but it doesn't works, I don't know what to do!
When I'm on the top of the spawner, the Y is 96, and when I'm on the ground, the Y is 65. By the way, I think the problem isn't the nether rack, 'cause I see on the gamepedia, and it says: "Usage: Netherrack can be used as part of a trapping mechanism for Mob farming."