At the start of your adventure in Dragon Quest 7 Reimagined, you are required to find fragments of a stone tablet. You will get the first two tablets easily – the first one will be with the prince when you first interact with the statue. The second one, you can find it back home with your father, who fished it out.
The third one will take you to the Estard Underground Path – Trial Room. Here, you will have to solve a puzzle to go through the locked door and get the fragment.
The quick guide below will show you how to solve the puzzle and progress in the quest to find adventure and access to new lands.
Solution to Estard Underground Path Trial Room

The goal of the puzzle is to move the two stone pieces on the board in such a way that they form a shadow of a keyhole.
The correct position of the stone pieces is shared in the above image, which should help you quickly solve the puzzle. Once the puzzle is solved, go to the pressure plate in front of the keyhole shadow, and the door on the right will open.


