YAPP adds three blocks:
Obsidian Pressure Plate, which can only be activated by players:
Mossy Cobblestone Pressure Plate, which can only be activated by mobs (skeletons, zombies, etc):
Clay Pressure Plate, which can only be activated by animals (cows, chickens, etc):
Due credit to Myrathi and FlowerChild for the original idea. I just wanted a quick and easy version for 1.7, so here it is.
Requires Forge.
