It says, "40% off select PS3, PS4, Xbox One or 360 video game of equal or lesser value when you buy Watch Dogs."
For the exclusions, it says, "Excludes clearance. Online orders exclude pre-sell items. Must buy Watch Dogs AND add to cart an eligible game of equal or lesser value for offer to apply."
So it basically seems like you can get any non-clearance game your store has on the PS3, Xbox 360, Xbox One, or PS4. I wonder if you could get a second copy of Watch Dogs 40% off, it doesn't say. I'm almost tempted to wait until Friday to try to get the deal, and see if I can play JUUUUST dumb enough to get them to give me Mario Kart 8 40% off, haha. The only thing is that I don't think they'll let you combine it with a price match, because I was going to price match Forza 5 to Amazon for $43.45, then mark it down and get it for $26.07.