Can games be grouped by degree of difficulty ( v3.42 for Mac)?

It'd help me decide which new game(s) to learn, depending on how much time/effort I can put in at any given moment. Does degree of difficulty have anything to do with the icons to the left of the game names, e.g., bear, snowflake, plus sign, etc.? If not, what do they represent?
Thanks for one of the best apps ever!

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