If there are a few installments in the ever-lucrative Call of Duty franchise that you, unlike every other human being alive on planet Earth, failed to purchase at launch, today's a good day to play catch up. Amazon's Lightning Deals are currently marking down prices on a bunch of installments on the shooter series, while the Deal of the Day is a discount on Call of Duty: Modern Warfare 2, currently available for $36.99 on Xbox 360, PS3 and PC.

Click past the jump for all the hints for the remaining Lightning Deals, which your considerable brainpower (and prior knowledge that it's a Call of Duty game) should make quick work of.