Create a drawing tool. Here is a very basic one. If you want to make continuous line, look at this example and get rid of the background. Try to make something expressive that allows the user to make something that looks unique and distinctive. Use conditional statements to provide at least two (ideally more) different "modes of drawing." For example, you could allow the user to choose between different pen types. One of your modes should use the random() function in some way.
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Game Design & Development