Editing Scratch:Basic Rules (section)

===Hit Points===

Characters have ''hit points'' which determine whether they are ''healthy'', ''injured'' or ''incapacitated''. A character's ''toughness'' ability level is his maximum hit points. ''Stamina'' is half of a character's toughness, rounded down. A healthy character has more hit points than his stamina.  An injured character has at least one hit point but no more hit points than his stamina. Characters can never have less than zero hit points. A character with zero hit points is incapacitated and cannot perform actions.

For example, if a character has 7 toughness, his stamina would be 3, so he would be healthy when his hit points are 4, 5, 6 or 7, injured when his hit points 1, 2 or 3, and incapacitated when his hit points are 0.

Some attacks cause damage when they are successful. Each point of damage reduces the target's hit points by 1. When an attack that causes damage is automatically successful, it causes 1 extra point of damage. An attack that normally causes 3 damage will do 4 damage when it is automatically successful. An attack that delays an opponent without causing damage still does no damage when it is automatically successful.