The Rules of the Death Note are the official rules that govern how the Death Notes work.Ryuk writes five of the rules down into his second Death Note before dropping it into the human world so that whichever human picks it up will know the basics of how to use it. Additional rules are revealed throughout the series.
"The ........... whose name is written in this note shall die."
"This ...... will not take effect unless the writer has the person's face in their mind when writing his/her name. Therefore, people sharing the same name will not be affected."
"If the cause of death is written within the next ... seconds of writing the person's name, it will happen."
"If the cause of death is not specified, the person will simply die of a ............ ."
"After writing the cause of death, details of the death should be written in the next .... minutes and ... seconds."
"If you make this Note unusable by tearing it up or burning it, all the humans who have touched the Note till then will die."