Several hints towards Kingdom Hearts III can be found in the credits for the game. Flying through all of the golden letters during the credits will unlock a secret message, stating "The past will be reawakened as a new number in never-before-seen detail. Prepare yourself for the awakening of the next number."

Additionally, several letters appear in the credits. When typed out in order of appearance, the letters spell out "this leads to KINGDOM HEARTS". Riku and Sora will then be shown walking into the light, making 3 pillars of light.