Boo-ray Machine

The Boo-ray Machine is a machine in Mario & Luigi: Bowser's Inside Story that Yikk built before he passed away. Yikk explained that the light makes the insides of one's body visible, and that it shows Boo transparency waves, giving off light and other special properties. Once Bowser activates the machine, Mario and Luigi, who are inside of Bowser to pursue Durmite, are able to access more of the Energy Hold, where they follow after Durmite. If Bowser keeps the Boo-ray Machine activated, Mario and Luigi may see hidden blocks somewhere. If Bowser deactivates it, several Boo-like blocks may appear as platforms.

Trivia

 * The Boo-ray Machine is used similarly to the Sea Pipe Statue.
 * The name could be a play on the video player, Blu-Ray. Also, the name could be a play on the one of the most used hospital devices, the x-ray machine.