Ultimate Play The Game (often shortened to Ultimate) was a video game developer in the 1980s. "Ultimate Play The Game" was the trading name of Ashby Computers & Graphics, Limited, a software company founded in 1982 by two ex-arcade game developers Tim and Chris Stamper. Ultimate released a series of successful games for the Sinclair ZX Spectrum, Amstrad CPC, BBC Micro, MSX and Commodore 64 computers from 1983 until its closure in 1988. Ultimate are perhaps best remembered for the big-selling titles Jetpac and Sabre Wulf, each of which sold over 300,000 copies in 1983 and 1984 respectively, and their groundbreaking series of isometric arcade adventures utilising a technique termed Filmation. Knight Lore, the first of the Filmation games, has been retrospectively described in the press as "seminal ... revolutionary" (GamesTM), "one of the most successful and influential games of all time" (X360), and "probably ... the greatest single advance in the history of computer games" (Edge).