The rules are simple I give you a list of games and you rank them in any order you'd like in any way you'd like. Here is that list and an example to follow.
LIST (Just ten games published and developed by Bethesda):
The Terminator
Arena
Daggerfall
Morrowind
Oblivion
Skyrim
Delta V
GridIron!
SkyNet
Fallout 3
Ranked: (Could be alphabetically, or longest to shortest, or bestselling to least etc.)
10. Delta V
9. GridIron!
8. Arena
7. The Terminator
6. Daggerfall
5. SkyNet
4. Fallout 3
3. Morrowind
2. Skyrim
1. Oblivion
My rank was on how long I spent playing the game, with Oblivion the most time spent and Delta V the least time spent.