INSTRUCTIONS : Click and hold when you think you've found a rotational centre, then move the mouse to rotate the mosaic around. When the rotated pattern patches the mosaic, pause for a second to identify the symmetry.
You can also use keyboard arrows to move the spot; press the spacebar when you're on a rotational centre, then use the arrow keys to rotate.
Unlock the fabled Fyodorov family vault with its 16 symmetrical mosaic locks! Can you reveal the secrets of The Code and become the Master of Mosaics!
Master of Mosaics is the third of four games for the new BBC Two series The Code - about maths in the world around us, presented by Marcus du Sautoy.
It's also a treasure hunt - we've hidden a valuable and unique treasure somewhere in the UK, and the clues to find it are within the show itself, in Lost-style symbols and messages, in online games, puzzles, and real-world challenges. There's even a clue in this game! Can you crack The Code?