Given the question: Information:  - The Amstrad CPC (short for "Colour Personal Computer") is a series of 8-bit home computers produced by Amstrad between 1984 and 1990. It was designed to compete in the mid-1980s home computer market dominated by the Commodore 64 and the Sinclair ZX Spectrum, where it successfully established itself primarily in the United Kingdom, France, Spain, and the German-speaking parts of Europe.  - The Sabreman series of games was released by Ultimate Play the Game for the Sinclair ZX Spectrum in the 1980s. Some of the installments were also released on other popular home microcomputers, namely the Amstrad CPC, BBC Micro, Commodore 64 and MSX. The series stars Sabreman, who is depicted wearing khakis and a pith helmet.  - Knight Lore is a 1984 action - adventure game by Ultimate Play the Game known for popularising isometric graphics in video games . It was written by company founders Chris and Tim Stamper in their Sabreman series . 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 . The game used a novel image masking technique , copyrighted as `` Filmation '' , in which images , such as the main character , could overlap other images without visual collision . This created the illusion of depth priority in on - screen images , which the computer hardware did not naturally support . Knight Lore was released third in the Sabreman series despite being the first completed . Ultimate anticipated Knight Lore to change the market and chose to withhold its release to protect the sales of its upcoming Sabre Wulf and to preempt Knight Lore clones by releasing a second Filmation game . Ultimate released Knight Lore shortly after its first two Sabreman titles in November 1984 for the ZX Spectrum . Ports followed for the BBC Micro , Amstrad CPC , MSX , and Famicom Disk System . The game was later included in compilations including Rare 's 2015 Xbox One retrospective compilation , Rare Replay . Knight Lore is regarded as a seminal work in British gaming history and has been included in multiple lists of top Spectrum games . Critics considered its technical solutions and isometric 3D style a harbinger of future game design . They praised the game 's controls and atmosphere of mystery , but noted its gameplay difficulty , and criticized its sound and occasional graphical slowdown . Knight Lore was the best - selling game of January 1985 and was named 1984 game of the year by the Golden Joystick Awards and Popular Computing Weekly readers . Though it was not the first isometric 3D video game , Knight Lore...  - The Commodore 64, also known as the C64, C-64, C= 64, or occasionally CBM 64 or VIC-64 in Sweden, is an 8-bit home computer introduced in January 1982 by Commodore International. It is listed in the Guinness World Records as the highest-selling single computer model of all time, with independent estimates placing the number sold between 10 and 17 million units. Volume production started in early 1982, marketing in August for . Preceded by the Commodore VIC-20 and Commodore PET, the C64 took its name from its of RAM. It had superior sound and graphical specifications compared to other earlier systems such as the Apple II and Atari 800, with multi-color sprites and a more advanced sound processor.  - Jetpac is a 1983 shooter video game developed and published by Ultimate Play The Game and released for the ZX Spectrum and VIC-20. It was also released for BBC Micro in 1984. The game is the first instalment in the "Jetman" series, and is the first game to be released by the company, who were later known as Rare. The game follows Jetman as he must rebuild his rocket in order to explore different planets, whilst simultaneously defending himself from aliens. "Jetpac" has since been included in other Rare games such as an unlockable in "Donkey Kong 64" and part of a compilation in "Rare Replay". The game later spawned two sequels and a 2007 remake, "Jetpac Refuelled", which was released for the Xbox Live Arcade service.  - An arcade game or coin-op is a coin-operated entertainment machine typically installed in public businesses such as restaurants, bars and amusement arcades. Most arcade games are video games, pinball machines, electro-mechanical games, redemption games or merchandisers. While exact dates are debated, the golden age of arcade video games is usually defined as a period beginning sometime in the late 1970s and ending sometime in the mid-1980s. Excluding a brief resurgence in the early 1990s, the arcade industry subsequently declined in the Western hemisphere as competing home-based video game consoles such as Playstation and Xbox increased in their graphics and game-play capability and decreased in cost.  - 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 and Graphics Ltd., 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").    After reading the paragraphs above, we are interested in knowing the entity with which 'knight lore' exhibits the relationship of 'designer'. Find the answer from the choices below.  Choices: - 1990s  - atari  - commodore 64  - rare  - tim and chris stamper
The answer is:
tim and chris stamper