Light Block

A Light Block (also known as a Glow Block ) is an item found in the game New Super Mario Bros. Wii and New Super Mario Bros. U. As the name suggests, these white blocks emit light that Mario and the other characters can use to illuminate dark areas. The characters must carry them in order to explore different areas with the help of the block's light. To pick up a Light Block, the player must shake the and press and hold  at the same time. Light Blocks are only present in dark and murky areas such as caves or Ghost Houses. They can also be used as a projectile, by throwing it to the enemies, in similar fashion to Super Mario Bros. 2's physics.

Light Blocks also appear in Mario Party 10 in the minigame Murky Maze.

In addition to normal-sized Light Blocks, bigger moving varieties also appear. These blocks appear as moving nearly-invisible blocks at first (which look similar to Blocks from Super Mario World), but if Mario or any other character hits a nearby ? Switch, the blocks temporarily glow and keep moving. These blocks can be used for both lighting the way and means of transportation.

In New Super Mario Bros. U, only the bigger varieties appear, and act as in the Wii version as platforms, but still illuminate dark areas. Some are activated by pressing a ? Switch. They mostly appear in Light Blocks, Dark Tower.

Trivia

 * In the Super Mario Mash-Up Pack in Minecraft: Wii U Edition, Redstone Lamps are replaced by Light Blocks.