There are many puzzles that one can buy when someone is up for the challenge on a challenging puzzle. First people start with like a 500 piece puzzle, then 1000, and then we can even go up to like 5000. There are even 3D puzzles that you can buy which add a different dimension in how you think about solving a puzzle.
If you are a fan of Game of Thrones and you want an intricate puzzle to satisfy your longing for a challenge, you can get the Game of Thrones 3D Map Puzzle. This puzzle is designed in three different layers.
Game of Throne fans, you would definitely want to get this.