Within "Kingdom Hearts 2.8" is a tiny slice called "Kingdom Hearts 0.2: Birth By Sleep - a fragmentary passage" that carries some classic KH elements in it. Unminding the ever confusing titles of the franchise, one such tradition is secret bosses activated by achieving certain things in the main game.

Throughout the realm of "Kingdom Hearts 0.2" are hidden Zodiac Chests that has Zodiac Relics. If you complete all of these, you'll have the chance to battle with a new and secret boss.

"Kingdom Hearts 2.8" fans are lucky of the existence of Suikan4ya, as the YouTuber has shared the chest locations seen in the video below. If you have played "Kingdom Hearts 0.2" before, you might want to do it again to unlock a secret boss battle. The boss battle will be made available once you have discovered 12 Zodiac chests that are scattered around the world map.

Once you have collected the required 12 Zodiac chests in "Kingdom Hearts 0.2," head off for the mirror world to unlock the secret boss battle. This is one thing players should not miss in the short prologue, and is worthy cause for a repeat.

"Kingdom Hearts HD 2.8: Final Chapter Prologue" includes a remaster of "Kingdom Hearts: Dream Drop Distance" and a movie that tells the backstory of the Foreteller with KH plus Back Cover. A prologue to "Kingdom Hearts 3" is also in tow, which features Aqua's time in the World of Darkness called Kingdom Hearts 0.2: Birth By Sleep -a fragmentary passage."

You can start locating the Zodiac chests and collect the relics to unlock "Kingdom Hearts 0.2's" secret boss by watching the video below. Or if you want a version in text, click through to proceed to RPG Site to read through the chest's locations. "Kingdom Hearts HD 2.8: Final Chapter Prologue" is now available for PlayStation 4.