The clock starts when you drop your first image in the drop-zone - so don't drop it until you're confident

The drop-zone is the main area of the map - this is the area above the white dashboard of photos

You can drag your image off to the left of screen to go to the next image - just make sure you're not in the drop-zone, but the dashboard

You score higher points for improved accuracy - the dark-blue arrow under the photo is the exact drop-point
If it's red, or not there, you're not in the drop-zone

You can click an image to view it full-screen - click it again to close it