Kiershar | Minecraft : Gravity grinder @kiershar | Uploaded October 2011 | Updated October 2024, 1 hour ago.
Nothing amazing, just one of many videos about mob grinders.

This grinder uses gravity to deal with any numbers of mobs coming in. Not very good for collecting string or killing animals.

Related tutorials :
30x80 Practical Monster Trap : youtube.com/watch?v=jiTNZXyMNeA