The Missed Target

is episode 199 of the original Naruto anime.

Synopsis
A Giant Ninja Bird drops countless copies of the letter of introduction into town, serving as a diversion from Gennō's true plan. The group discovers that a kunai target in the Ninja Academy dojo is actually the trigger for explosive tags in the academy, and that explosive tags are planted all across the village.

Trivia

 * Shikamaru calls the papers falling from the sky the blueprints in the previous episode. But Shizune tells Tsunade that they are copies of the introduction letter written to the head carpenter in this episode.