Or try this:
List for whatever you like (start on the high side a little), then reduce it $100-200 every week if it's still unsold.
Eventually you find the true value, regardless of everyone's advice/opinions.
Anyway, good luck with the sale.
I like the game and would consider buying it if I was more certain it wouldn't keep dropping in price.
Might be best to just hold it til it comes back up in value.
No guarantee that will happen, but I wouldn't be surprised.