Never betray your clan.
Accomplish the mission; failure is not an option.
Always put the clan and the mission before yourself.
If you are captured, escape.
If you cannot escape, commit seppuku.
If you can't rescue a comrade, take his life. It's better for them to die than to fall into the hands of the enemy.
Serve the clan with unquestioning obedience.
Serve the your leader with unquestioning obedience.
Live in shadow; never reveal your true self.
If it is not necessary to the mission to kill, don't kill.
If it is necessary to the mission to kill, don't hesitate.
Never strike a member of the same clan without the order or permission of the Leader.
To leave the clan is to die; No nukenin (rogue ninja) may be allowed to live.
Your master's enemies are your enemies.
Never arrange a contract yourself.
Never question or refuse a mission.
Strive for peace, harmony and enlightenment in all things.
Never use the terms “ninja”, “shinobi”, or “assassin” when speaking in public. Use code words and metaphors when speaking in public so as not to jeopardize yourself, the mission or the clan.
Always observe others and know your surroundings.
You are always being observed. Always.