Space Subtraction

Space Subtraction is a series of 1-player subtraction games for the Apple II.

• Blast Off: The player answers 25 questions, and each correct answer progresses a portion of a cartoon of a rocket launch.
• Cosmic Creatures: Every 4 correct questions, the player adds a piece of an alien creature.
• Shuttle Trip: The player answers 20 questions, and each correct answer progresses a portion of a cartoon of a shuttle launch.
• Space Match: Every 5 correct answers, the player can play Space Match. The player tries to math an item on the left of the screen to the correct item on the right.
• Zemoon Walk: Every 5 correct answers, the player engages a minigame, where they try to guess where on a number line from 0 - 100 a flat space lies to allow an alien ship to land.