I am a third year GDD student at RIT.
My idea of an activity for the XO is a math based jigsaw puzzle. The activity will come with a few pre-made puzzles. It will have a teacher edit tool where teachers can make their own puzzles. Puzzles can be as complicated as a castle or as simple as a square. The teacher will be given a grid where he/she can specify how the puzzle is supposed to look. Then the teacher chooses what type of operator he/she wants (+, -, x, /). Then the teacher inputs the answer. The activity randomly chooses what number will appear on the sides of each square.
To complete each puzzle the student has to match the sides of squares together so that the numbers finish the math equation at the top of the screen. The puzzle is completed when all pieces are used and are in the correct positions. Below is an example of how a game may progress.