What games did you and your friends invent or make up when you were young?

Childhood imagination had no rulebook. You and your friends probably turned backyards into kingdoms, driveways into racetracks, or living rooms into obstacle courses. What were the rules — and how seriously did you take them? Think about the creativity and collaboration involved, the small disputes over fairness, and the joy of inventing something that belonged entirely to you. What do those made-up games reveal about who you were then?