The Light Pen is an accessory for the Vectrex released in 1983 by GCE. It was quite revolutionary for its time, but because of the Great Video Game Crash of 1983, it ended up as a commercial failure. Packed in with the accessory was the game Art Master.
During its lifetime, GCE managed to release three games for it: Art Master, Melody Master and AnimAction. There was also a prototype, Mail Plane, that never managed to get a release.