Drawing on the eleventh creative challenge, “Scratch goes trick-or-treating,” create a game in which Scratch has to run away from the snowballs thrown by Penguin. You are expected to create your own scoring system so that Scratch is able to make points (suggestions: Scratch could make one point when he collides with Vibot, when he catches different objects that might be moving randomly, or simply when he successfully avoids getting hit by a snowball). Be creative! Step 1. Situation analysis Which algorithm allows a sprite to move randomly? How can we make a sprite move to make a certain shape (for example, to make a square)? Which algorithm must we use to create an effect when two sprites collide? How can we program a scoring system on Scratch that will determine whether or not Scratch wins the game? Step 2. Situation modelling On a sheet of paper or on a Google Document, write down the different systems that your game will require (movement algorithms, scoring system, etc.) When your systems have been sufficiently analyzed, you can start programming your game. Step 3. Program your game Find the algorithms that will allow the three sprites to move from one place to another (Scratch will move according to the keys pressed by the player, and Penguin and Vibot will move either randomly or according to a trajectory of your choice). Find a way to make Penguin shoot his snowballs towards his friends. When Scratch will collide with a snowball, he will lose a point. Create a scoring system and determine the amount of points that Scratch requires in order to win the game. Make sure that the sprites’ movements are as natural as possible. Don’t forget that the program must start from the beginning when we hit the green flag. Suggestions: You can add different levels of difficulty if you consider your original game to be too easy or too hard. You might decide to add other levels and to add different obstacles in each level. You could add a shelter (for example, a tree or a fence) behind which Scratch could hide to avoid the snowballs. Why not add a song to contribute to the overall gaming experience?
