Cubicolor

Based on the two-player puzzle game Rubik's Race, Cubicolor was programmed in 1982 by Rob Fulop in eight weeks time after programming Demon Attack and before programming Cosmic Ark, but it was not released because Imagic wanted an action game instead. Fulop kept 100 copies of this unreleased Imagic ROM. He signed and numbered 60 of them personally and sold them (together with a simple black & white background history lettter and instruction sheet) for $50 and later for $100 each.