Rasterscan is a computer game published in 1987 by Mastertronic

Mastertronic

Mastertronic was originally a publisher and distributor of low-cost computer game software founded in 1983. Their first games were distributed in mid-1984. At its peak the label was the dominant software publisher in the UK, a position achieved by selling cassette-based software at the £1.99...

 for several 8-bit

8-bit

The first widely adopted 8-bit microprocessor was the Intel 8080, being used in many hobbyist computers of the late 1970s and early 1980s, often running the CP/M operating system. The Zilog Z80 and the Motorola 6800 were also used in similar computers...

 formats. It was written by Binary Design Ltd based in Parsonage Gardens, Manchester with the C64 version programmed by Phillip Allsopp (aka Sarge).

Plot

The Rasterscan, a large damaged spacecraft

Spacecraft

A spacecraft or spaceship is a craft or machine designed for spaceflight. Spacecraft are used for a variety of purposes, including communications, earth observation, meteorology, navigation, planetary exploration and transportation of humans and cargo....

, is drifting uncontrollably towards a nearby star. The Rasterscan can still be controlled and piloted to safety but only by a droid called MSB. Unfortunately, MSB is also damaged and (without help) can only repair toasters. The player needs to control MSB and, hopefully, use it to save the unfortunate spacecraft.

Gameplay

The player controls MSB, a spherical droid who can float through the interior of the ship in all directions. MSB can interact with the craft's machinery and instruments, which all serve a purpose. It also needs to solve logic-puzzles in order to open doors (different puzzles for each door) to allow it access to more parts of the spacecraft.