This mod adds pistons to the game, which it seems is one of the few mods that actually builds onto the game and improves/makes things more interesting.
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Pistons will extend when powered by redstone, and retract when unpowered. When placed, the block will face towards you. You can re-orient them by right-clicking. Pistons will push blocks in front of them. They will not push bedrock, obsidian, or other pistons. They will also not push more than 16 blocks.
Pistons will push entities out of their way, so that they can be used to make launchers. If sand or gravel is pushed upward by a piston, it will fly into the air.
Pistons will block the flow of water or lava. They will also push blocks added from other mods.
One of the amazing things you can do with this mod, is create self repairing bridges and walls if you position blocks properly.
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This mod Requires Modloader.
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