CHALLENGE: Find the hidden coin! <br><br> Information Each Chess piece hides a lucky coin inside and it's up to you to challenge your luck. A unique secret system, different for each Chess-piece-style, will need discovering. How does this Rook open and reveal you its hidden coin? <br> Difficulty: INCREDIBLE 5/6. Average solution time: 1 hour - 1 year. <br> Dimensions: diam.3,6 x 6.0 cm. <br> Weight: 203 gr. <br> Box Dimensions: 14 x 17 x 5 cm.