Just updating the game here a bit and implementing some new things.
This is known as the Dungeon Rank System, in every dungeon of the game, you will be scored among getting and completing various things. These things include how many items in the dungeon you find, how many chests you found and opened, and how fast you completed the dungeon.
Ranks are based as follows:
S Rank - Met all requirements!
A Rank - Missed one requirement
B Rank - Missed two requirements
C Rank - Missed all three
You will be rewarded with various loot, gold and EXP depending on which rank you achieved for the dungeon. Hope this little system will encourage those completionists, those who love exploring, or also just as a nice incentive!