We've added five more castles to the list of Duckwyn destinations. These are some of the largest castles you can visit in the world. Explore them using your Duckwyn passport to receive the new castle badge. The castles are:

• Malbork Castle in Poland
• Mehrangarh Fort in India
• Prague Castle in the Czech Republic
• Windsor Castle in England
• Hohensalzburg Castle in Austria
• Castello Sforzesco in Milan

We'll be adding more castles shortly including Edinburgh Castle in Scotland and Spis Castle in Slovakia. To earn the new badge you will need to visit any five castles using the app.

Get out there. Explore your world. And let us know which new challenges you think we should add next.