Here is an extension of my first experiment with Scratch 2.0 alpha. It's a simple bit of target practice. Use the left and right arrow keys aim the cannon and the space bar to fire. I used variables to create loaded and unloaded states for the bullets so the space bar has to be released between shots. I also included a variable to the cannon that prevents it from pivoting when it is firing (when the space bar is pressed). This project is to test how high scores are saved can be saved using a cloud variable.
