Editing Light Blocks, Dark Tower

'''Light Blocks, Dark Tower''', or '''Rock-Candy Mines-4''', is the fourth course of [[Rock-Candy Mines]] in ''[[New Super Mario Bros. U]]''. It is unlocked via completion of [[Grinding-Stone Tower]] or [[Shifting-Floor Cave]], and its own completion opens the path to a blue [[! Switch]], a spot where a [[Bubble Baby Yoshi]] resides, a Green [[Toad House]], and the level [[Walking Piranha Plants!]].

The level begins in a [[dark]], underground area with large [[Light Block]]s that periodically shift between on and off. A [[? Block]] containing a [[Super Star]] is found to the left of the player's starting position. As Light Block platforms are climbed vertically, [[Swoop]]s can be found. Rope ladders are found, along with Light Block platforms that move. ? Blocks that contain Super Stars if the player is [[Invincible Mario]] are found in the area as well. More moving Light Blocks are found, as well as Swoops, leading up to a [[Warp Pipe]]. The Warp Pipe leads to the area with the [[Checkpoint Flag]]. More Light Block platforms are found in this section, though they are activated temporarily using [[? Switch]]es found throughout the area. A [[Bob-omb]] is found on moving Light Blocks, and is followed by a yellow Warp Pipe blocked by [[Brick Block]]s, which leads to an area with Bob-ombs and a [[crate]] containing a [[1-Up Mushroom]]. More moving Light Blocks follow, as well as [[Fire Bro]]s and Warp Pipes that spawn Bob-ombs. A Warp Pipe at the end of the section leads to an area with a [[Koopa Paratroopa|Paratroopa]] and the [[Goal Pole]].