What are the rules of the Shinobi Code of Conduct? I was watching Naruto Shippuden during the Kakashi chronicles, and he mentions that rule 25 is that a Shinobi isn't allowed to cry.

What are the other rules (that have been revealed)?
There are a few more indeed.


  
  Rule #04. "A shinobi must always put the mission first."
  Rule #25. "A shinobi must never show their tears.
  Rule #??. "A shinobi must see the hidden meanings within the hidden meanings."
  Rule #??. "A shinobi must follow their commander's instructions."
  Rule #??. "A shinobi must prepare before it is too late to."
  Rule #??. "A shinobi must never show any weakness."
  


There also seem to be war-specific rules


  During the Warring States Period, one of the rules forbade shinobi from revealing their surnames for fear of retaliation outside of combat. 


as seen in the Wikia.