Players move about the board, which depicts the Tower of London, and attempt to steal the British Crown Jewels.

In reality, the only modern attempt to steal the Jewels was made in 1671 by Thomas Blood and his accomplices, who failed to escape — an earlier attempt in the early fourteenth century was equally unsuccessful — and the game challenges players to "succeed where they failed".

Players begin at the “Start” square, and must move forward along the wall walk (yellow), not deviating from this path until they reach the Queen's House and are accredited or are instructed to go somewhere by a card.

To be accredited at the Queen's House, a player must either surrender a Tower Pass or roll an odd sum.

Accreditation is denoted with a flag inserted into the playing piece, and enables a player to move in any direction as they choose (as opposed to only anti-clockwise on the wall walk).

On the same turn, the attacker selects and places face down a combination of weapons (and armor,[1] though this may only be used in defense), and the defender will do the same you can not take play more cards then you have first chosen.

This set, featuring handcrafted jewels of genuine precious metals and stones, is the most expensive board game in the world at £7995 (approximately $15,000 US).