Throw The Gun Level

This level is found in L Level. This area is cursed so you cannot take any items from it. There is a hidden Green Gun in the mid-left nook. Fire at a green gun at the Cyan Beetle to disable it. To get the beetle back to the save room, you'll need to bring a Pink Gun or Save Room Box.

In the top right corner there is a Black Gem and Silver Gem. You can get these by throwing the Green Gun at the ceiling to use them.