Mission Asteroid, a main game adventure released in 1980, casts you as an astronaut tasked with destroying a rogue asteroid threatening Earth. Gameplay relies on a simple text parser, accepting one- or two-word commands to navigate and solve puzzles. Uniquely for its time, this interactive fiction blends text descriptions with graphical illustrations. It was designated as the 'zero' entry in a series due to its accessible difficulty, available on platforms like the Apple II and Commodore 64.
As an adventure title from the early era of interactive fiction, the primary interaction method relies on a text parser. Players input simple commands, typically one or two words, to interact with the environment, examine objects, and progress the narrative. Success depends on correctly interpreting the textual descriptions and utilizing the limited command vocabulary to manipulate the environment and achieve the objective of destroying the asteroid.
The gameplay loop centers on exploration, puzzle-solving, and command execution within the confines of the space mission narrative. This title is notable for being one of the earliest text adventures to incorporate graphical illustrations alongside the text descriptions, offering visual context to the unfolding events.
The atmosphere is one of immediate global peril. The setting shifts from Earth to the vastness of space as the player undertakes the critical assignment. The storyline focuses entirely on the race against time to avert planetary catastrophe, requiring precise action from the astronaut protagonist.
What sets this game apart within its genre, particularly for its time, is its development lineage. It was the third text adventure featuring graphical support developed by On-Line Systems. Despite this historical significance, it was released as number zero in a subsequent adventure series due to its relatively straightforward difficulty level, which is reflected in the simple, one- or two-word command structure required by its parser.
This main game title was made available across a variety of early computing systems. Original platforms include the Atari 8-bit family, various Japanese home computers such as the PC-9800 Series and PC-8800 Series, the Commodore C64/128/MAX, the FM-7, and the Apple II.
As a classic title from 1980, there are currently no officially released downloadable content packs or expansions associated with this main game. The current state of the game reflects its original design as a foundational text adventure experience.