Welcome to a new recurring column at mentalfloss.com, the Brain Game. Each weekday, we'll throw a new puzzle at you, ranging from riddles to logic challenges to really, really bad rebuses. Today's MFBG (mental_floss brain game) mixes a bit of wordplay with a bit of geography. Here it is:

The name of what Nevada city can be made into the name of what California city by adding the letters S and F?

Click here for the answer.