Sun Tablet

The Sun Tablets are ancient tablets that appear on the PS2/Wii version of Sonic Unleashed, and are needed to progress the story.

Created in ancient times, the Sun Tablets serve as a mean for their user to open the door with a sun symbol inside their respective Gaia Gate which leads to certain areas on the continent. In gameplay, these tablets unlock the local continent's Day Stages where Sonic the Hedgehog is playable. Despite there being seven Gaia Gates spread across the the world there exist only six Sun Tablets, since Mazuri's lacks a Day Stage.

Each of the Sun Tablets are designated to a specific Gaia Gate, and as such they cannot susbtitute the Sun Tablet for another Gaia Gate other than their own.

In the game's story, most of the Sun Tablet's lies in the possession of one of the people from the local vilage, which are usually the guardians of the Gaia Temples or someone associated with them. In order to obtain a Sun Tablet for the local Gaia Gate, Sonic must talk to a specific person found on the same continent, and they will hand it over to him.

Trivia

 * In Adabat, the sun on the Sun Tablet has become the symbol of the village's tranquility.