Defining the Game

If you recall, back in Chapter 4, I discussed the design process. In the Brainstorming section, I laid out a boilerplate for defining the game. For the game we develop in this chapter, here are the objective and rules:

Idea: Alien Turtle Invasion

Objective: Shoot all the turtle invaders before they shoot you.

Rules:

• This is a single-player game.
• The game is played in space.
• There are 10 enemy ships.
• There is one spaceship to defend earth.
• Invaders will move back and forth across the screen.
• Invaders will fire missiles at a set interval.
• The spaceship is controlled by the player.
• The defender can shoot lasers at the turtle invaders.
• The game is over if the player’s spaceship is hit by a missile.
• The level is over if all the turtle invader ships are destroyed.