Before you read this page, you should first read Advanced Circuitry.
A Redstone Machine is a set of Redstone circuits, gates, andor blocks that has a useful purpose in the game.
Block Swapper[]
See Also List of Block-Swappers
A block swapper is a machine that swaps one or more blocks for one or more others. The most common use is to swap one block for another, for instance, to show or hide glowstone for lighting.
Piston double-extender[]
See Also List of Piston Double-Extenders
A Piston double-extender is a machine that extends a sticky piston by two blocks without losing the sticky functionality. This is considered a challenge because a sticky piston will only pull one block, so if the back piston pulls the front piston, the target block to be moved will remain stationary. To solve this, the front piston is fired again to pull the block back.