the rules of hopscotch.

When you're playing hopscotch, the whole point is to jump from boxes to boxes, to not overstep your boundaries, but to play inside your flat chalk cage.
Is it okay to have your feet hit the lines or not? Just the inside of the line? Halfway over? What about if half of your foot is inside, does that make it okay? What about if you're just touching the outside of the line?
What if you're outside the lines completely?

I don't remember having the rules defined as a child. Then again, I don't remember playing much hopscotch.

The line gets drawn somewhere for everything. The problem is knowing how close to the line you can get, which side to be on, and whether or not you can jump over without taking the risk of losing.

And this is why children shouldn't have serious relationships, because then they'll compare relationships to games that they don't even thoroughly know the rules of.