THE WAY STEAM LIBRARY ORGANIZES

-D
DOOM 3
DOOM 64
DOOM II

-F
Final DOOM

-U
The Ultimate DOOM

Or how about metal gear?

Want:

-M
Metal Gear
Metal Gear 2
Metal Gear Solid
Metal Gear Solid 2
The Document of Metal Gear Solid 2
Metal Gear Solid 3
Metal Gear Solid - Portable Ops
Metal Gear Solid 4
Metal Gear Rising - Revengeance
Metal Gear Solid - Peace Walker
Metal Gear Solid 5 GZ
Metal Gear Solid 5 PP

Reality:

-D
The Document of Metal Gear Solid 2
-M
Metal Gear
Metal Gear 2
Metal Gear Solid
Metal Gear Solid - Peace Walker
Metal Gear Solid - Portable Ops
Metal Gear Solid 2
Metal Gear Solid 3
Metal Gear Solid 4
Metal Gear Solid 5 GZ
Metal Gear Solid 5 PP

and I havent even added the non-canon games yet!

ARGH CURSE YOU GABE