Special Property

You need to set which properties are special if you want to change you icon appearance if:

• Level is locked
• Level is completed
• And if you want to display the level number

That’s easy thing to do. First you have to create new property. For locked and completed it can be any type, but level number must be Text. Then you have to choose this property from the list in Special Properties section.

You can read more about this here.