In the standard version of Arcaea (the vanilla game you download from the App Store or Play Store), every playable song has a set of chart difficulties: Past, Present, Future, and increasingly, Eternal.

However, "Autoplay Exclusive" usually refers to one of two things:

Add an "Autoplay Exclusive" mode that creates unique, collectible autoplay performances for players to unlock, share, and customize — blending replayable visual flair with progression and social features.

Cheat developers often keep autoplay tools private to avoid:

Hence, “autoplay exclusive” in underground forums means “a private autoplay method not shared publicly.”