The pitfall block acts like a normal block when placed. If it receives a redstone signal it will fall to the ground like sand. It will also activate neighboring pitfall blocks to fall down as well. This can cause a cascade effect which allows you to use less redstone.
This block can be useful for building bridges that collapse on command, cages that fall from the sky, and I’m sure you will be able to think of some others. The recipe is shown in the video.
Installation:
Singleplayer Instructions
Multiplayer Instructions
If you’re having problems please reinstall ModLoader. Then make sure you deleted META-INF from minecraft.jar. If that doesn’t work, and you’re sure you reinstalled modloader just now, it could be a blockID or itemID conflict. These mods will automatically create a file in (minecraft folder)/mods/DJoslin/, open that file and change the ID to an unused one.
For Minecraft 1.5.2
For Minecraft 1.5.1
For 1.3.2