- The article describes a "Spot the Difference" game promotion by Amazon, where users can play an online game to win free Amazon gift cards. The game involves finding the differences between two similar images, and players who successfully complete the game can enter a drawing to win one of several Amazon gift cards worth $100 each.

- To participate, users must download the "Spot the Difference" app from the iOS App Store or Google Play Store, and then play the game within the app. The game features a variety of image pairs, and players must tap on the differences they find within a limited time frame. Completing the game successfully enters the player into the drawing for the Amazon gift cards.

- The article notes that the promotion is only available for a limited time, and that the winners will be randomly selected from the pool of eligible participants. It also provides a link to the app download page, as well as a reminder to users to carefully review the promotion's terms and conditions before participating.