It is widely considered one of the series' best episodes, featuring Erwin Smith’s legendary "My Soldiers, Rage!" speech as he leads a suicide charge to create an opening for Levi Ackerman. Sports & Baseball
In sports, specifically baseball, a "perfect game" is a rare pitching masterpiece where no opposing player reaches base. 4 : Perfect Game
Depending on the context you're after, "4 : Perfect Game" likely refers to a pivotal anime episode, a specific record in sports, or a music track. It is widely considered one of the series'