Uncharted 4: Prison Puzzle Solution [Chap. 2, puzzle]
In this guide we see how to solve the puzzle of roman symbols and numbers on the prison wall in Uncharted 4 a Thief's End. Do not forget to also consult the complete guide of Uncharted 4 the End of a Thief which collects many other useful guides on this game.
Avoiding any unnecessary spoilers, let's say that at some point in the Chapter 2 of the game, inside the prison you will have to solve a puzzle by interpreting the symbols found on a wall. Here is the solution:
To complete this puzzle, start by interacting with the Sun / Moon symbol on the wall near the door. Look around and you will notice the 2 signs that are seen on the card / clue with Roman numerals below.
One will have II (2) and the other will have X (10), just add the two numbers to get the solution, that is the number XII (12). Then interact with stone XII which is on the same wall where you dropped into the cell.
Do exactly as shown in the video and you too will solve this puzzle. If you have difficulty with the other puzzles of the game, consult the guide / solution to ALL the puzzles of Uncharted 4 now.