Could you tell us a bit more for us to be able to help you? Do you get any error message or a road block? What is happening when you play level 860?ย
The first thing to do in that case is to clear cache and cookies from your device and make sure you have the latest game version installed. Check in your App Store or Google Play store for updates!ย
If that does not open the map, please let us know what device you're playing on - A screenshot would be helpful too