I have enough difficulty with creating things for people without food allergies, so I know the gluten free would be a difficult task! (themisfitbaker.com)
The enemies did not overwhelm the game, but added enough difficulty to keep the game interesting. (gamingcypher.com)
Those of us involved in school lunch programs already have more than enough difficulties planning nutritionally sound meals that kids will eat. (articles.chicagotribune.com)