Thermodynamics — The thermodynamics portion of chemical engineering is extremely tough and the assignments also fall under the same difficulty level. (instantassignmenthelp.com)
For Auro, I worked very hard for years to make sure that every match (at a given rank) has roughly the same difficulty level specifically so that every match «matters» and none are throwaway «easy wins» or «brick walls». (keithburgun.net)
No link to World Tier — every player plays at the same difficulty level (you start with a simple green pistol) and works your way up (segmentnext.com)