Jetpac

The game world is presented in a horizontal wraparound and consists of three platforms which Jetman can manoeuvre onto. Jetman must assemble his rocket (which spawns in pieces scattered around the map), and then fill it with fuel before taking off to the next planet, where the procedure is broadly repeated with alternate procedures. In addition, the player has to defend themselves from the planet's aliens, and for bonus points collect valuable resources which occasionally fall from above.

After the first level, the rocket stays assembled and just requires refuelling. However, every four levels, the rocket resets (giving the player an extra life) and the replacement has to be built before it can be refuelled for takeoff. Each new model has a new design with a higher number written on it, although the core gameplay remains unchanged. The enemies change forms each level (cycling back to the first after eight levels) and each alien has a different pattern of movement which means they can be dealt with in a different manner.

Ultimate Play the Game was founded by brothers Tim and Chris Stamper, along with Tim's wife, Carol, from their headquarters in Ashby-de-la-Zouch in 1982. The company were known for their reluctance to reveal details about their operations and then-upcoming projects. Little was known about their development process except that they used to work in "separate teams"; one team would work on development whilst the other would concentrate on other aspects such as sound or graphics. While developing Jetpac, the Stamper brothers closely studied the burgeoning Japanese gaming market and had started to practice developing games for their then-upcoming console, the Famicom, later predicting that the ZX Spectrum had a limited lifespan.

Jetpac was one of the few Spectrum games also available in a ROM format for use with the Interface 2, allowing "instantaneous" loading of the game when the normal method of cassette loading took minutes. The game was also able to run on the 16K version of the Spectrum.

The game sold over 300,000 copies and generated £1 million in revenue for Ultimate Play the Game, which enabled the Stamper brothers to gain a foothold in the early video gaming market.

The game was critically acclaimed. Crash praised the graphics and presentation, citing that they were of "the highest standard" and added that it was "difficult to find any real faults" with the game. CVG similarly praised the graphics, stating that the presentation was "superb" and the gameplay was considered addictive. In a retrospective review, Chris Wilkins of Eurogamer noted that the colourful graphics and sound effects were advanced for the time, but what truly made for a "faultless" experience was its simple gameplay.

After the game's release, Jetpac was parodied in a long-running Crash comic strip named Lunar Jetman. The strip, designed by John Richardson, lasted from July 1984 to October 1991 and gained popular reception from readers. To develop the comic, photographs had to be processed manually on a photomechanical tone and then transferred to paper, being fully colourised in the late 1980s.

Jetpac was followed by two sequels: Lunar Jetman (1983) and Solar Jetman (1990). The latter was not released for the ZX Spectrum, instead released for the Nintendo Entertainment System by Nintendo; a version for the Commodore 64 was finished but never released following disappointing sales of the original NES version.