Minecraft wiki entry for Mob_grinder, associated text: 1 Common grinders
1.1 Fall damage grinder
1.2 Magma blocks
1.3 Wither roses
1.4 Lava grinders
1.5 Campfire killer
1.6 Trident killer
1.7 Piston grinder
2 Alternative grinders
2.1 Mob cramming grinder
2.2 Cactus choke
2.3 Sunlight grinder
2.4 Mob arena
2.5 Anvil smasher
2.6 Sweet berry bush
2.7 Floor-suffocation grinder
3 Item collection
4 Video