User blog comment:Cinnabar The Evil Gem Chemist 55555555555555555550/Interesting Question 1 - What is the most used difficulty?/@comment-4189499-20150603033610/@comment-4189499-20150605082257

Here it is: the mean, median and mode of each world, using the data above, ignoring the variable levels.

Reality

 * Median :Medium
 * Mean :Just more than medium
 * Mode :Medium

Dreamworld

 * Median :Medium
 * Mean :Just more than medium
 * Mode :Somewhat easy

Conclusion
Reality and Dreamworld levels are weighted approximately equally in difficulty levels. There is no need to panic.