Step 1 - Create Scene and Ship

• Create a blank Project
• Under the Project Info, change the name to Asteroids, the platform to GameSalad Arcade and give it a brief description
• Click on Scenes, double click on Initial Scene and change the name to Level 1
• Double Click on the Level 1 screen to open the scene
• In the inspector, click on the Scene button
• Under Attributes check the boxes next to Wrap X and Wrap Y
• Click on the Game button
• In the Library (the lower window), click on Images and drag the images you just downloaded into the project (keep in mind that they are white images on a clear background so you won’t see them, you’ll only see the names)
• In the Inspector, create a new actor and name it Ship
• In the inspector, double click on the ship, and set the following attributes: width 14, height 25
• Under the Motion section, set Max Speed to 600 and check Apply Max Speed
• Under the Physics section, set the Drag to 100
• In the library (the Images button should still be active) drag the Ship image on to the place where it says “Drag Image Here”
• On the top, click Scenes, Level 1, and drag the ship to the center of the stage

Step 2 – Getting the Ship to Rotate

• Double click on the ship on the stage to program the instance
• Click the lock and add a rule.  Name the rule “Rotate Counter-Clockwise”
• Change Mouse Position to Key
• Click Keyboard and choose the Left button
• In the library, make sure Behaviors is selected, and drag Rotate onto the Add your behaviors here section
• Leave the direction as Counter Clockwise and change the speed to 300
• Copy this rule by holding down the ALT key and dragging the titlebar of the rule on to the blank part of the rules section
• Name the new rule “Rotate Clockwise”
• Click Keyboard and choose the Right button
• Change the direction to clockwise
• Test your game – the ship should rotate when you hold down either arrow key.

Step 3 – Getting the Ship to Move

• Click the back button to go back to the ship’s rules.  Add a rule and name it “Move”
• Change Mouse Position to Key
• Click Keyboard and choose the Up button
• Drag an Accelerate behavior onto the rule and change its Direction to 90 and its Acceleration to 450.  Make sure it stays Relative to Actor
• Add a Change Image behavior to this rule and set the image to shipmove
• Click the arrow next to the Otherwise section of this rule to open it.  Drag another Change Image on this Otherwise section, but now set the image to ship
• Test your game

Step 4 – Getting the Ship to Fire

• Click Scenes, then Level 1.  Create a new actor in the Inspector and call it Bullet
• Double click on the Bullet in the Inspector set both its width and height to 1
• Drag a Move rule onto the rules area and name it “Bullet Motion”.  Change the speed to 600
• Drag a Timer on to the rules section and name it “Bullet End”.
• Change the “Every” to “After” and make it .5 second
• Drag a Destroy action on to the timer
• Click Scenes at the top, then Level 1, and then double click the ship on the stage
• Add a new rule and name it “Fire Bullet”
• Change Mouse Position to Key
• Click Keyboard and choose the Space button
• Drag a Spawn Actor on to this rule
• Change the actor to Bullet
• Change the direction to 90 and the position to 0 and 12
• Test your game