Master of Orion is a turn-based game. In the first iteration of the franchise, one can only play against the AI (the computer). Human and AI players control the management of colonies, technology development, ship construction, inter-species diplomacy, and combat.The software generates a map randomly at the start of each game; the player can only choose the size of the galaxy, and the number and difficulty of AI opponents. In the first game, star systems have at most one colonizable planet and a few have none. Later games have more planets.