Hello dear developers !
When you open the window of missions you can choose the difficulty, but unfortunately not all players read the description of each. I suggest that the inscription Normal, Advanced and Elite more informative.
Normal - to write a large and beautiful. Next to or in the background paint a little bit of Copper Crown, Copper-Silver Crown, small ember of heat and material with a question mark inside.
Advanced - same as in Normal, but add Silver Crown, Silver-Gold Crown, medium ember of heat and orb of alchemy.
Elite - same as on Advanced, but add Gold Crown, large ember of heat and spark of life.
This idea needs work, sketches and so.

Best wishes , Ne-Zo.