Knight Lore is a 1984 action-adventure game developed and published by Ultimate Play the Game, and written by company founders Chris and Tim Stamper. The game is known for its use of isometric graphics, which it further popularized in video games. In Knight Lore, the player character Sabreman has forty days to collect objects throughout a castle and brew a cure to his werewolf curse. Each castle room is depicted in monochrome on its own screen and consists of blocks to climb, obstacles to avoid, and puzzles to solve.

Ashby Computers and Graphics Limited, trading as Ultimate Play the Game, was a British video game developer and publisher, founded in 1982, by ex-arcade video game developers Tim and Chris Stamper. Ultimate released a series of successful games for the ZX Spectrum, Amstrad CPC, BBC Micro, MSX and Commodore 64 computers from 1983 until 1987. 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 using 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).