How the game is played/scored. This should be information about WHAT to do, but please save WHY for the "Design" field.
Additional rules could be added because:
- You've decided that the game is better in every way with the new rule.
- You found a *slight* tweak that makes a small difference in a meaningful way. (If it's a big enough change just make a new game and tag it as a variant of this one.)