The light cube table was an electronic game played on a four-sided table in the 23rd century. The game involved two to four players who placed their hands on a square pad in front of them, and lit up cubes in the center of the table.
Commander Will Decker used the game in an attempt to determine whether V'ger truly possessed Ilia's memories. He stated that Ilia enjoyed the game and "nearly always won." (Star Trek: The Motion Picture)
The name of the game was not given in the movie, but the name was given in Mr. Scott's Guide to the Enterprise.