It looks similar to a Rubik's Cube, but has shapes on it. The colors on the cube are blue, red, yellow, green, and white. It is able to solve itself and never lies.
Role in series
"House Sittin' for Sandy"
The puzzle cube is seen on the bookcase full of Sandy's rare artifacts.
"The Krabby Patty That Ate Bikini Bottom"
Sandy shows Mr. Krabs the puzzle cube during the latter's brief visit at Sandy's treedome. Later, Sandy tells SpongeBob that the puzzle cube told her that he was the one who could stop the Giant Krabby Patty by making direct contact with it.