Top Trumps is a wildly successful card game that plays out a little like War.

Each card has a series of statistics. On your turn, you look at your top card and call out a stat (typically the highest one on your top card), and the player whose top card has the highest value in that stat wins the “trick”.

Top Trumps has sold over 40 million cards, and has been licensed up the Wazoo. That’s not entirely bad, as some versions of the cards provide an opportunity for a slight amount of education. The latest deal is with Ripley’s Believe it or Not. (source)

Amazon sells Star Wars Starships, Star Wars – Episodes IV – VI, Star Wars – Episodes I – III, Animals, Indiana Jones, Doctor Who, The Simpsons, Shrek 2, Lord of the Rings The Two Towers, The Lord of the Rings the Return of the King, Dinosaurs, Sharks, Space Phenomena, Wonders of the world, The Davinci Code, Sealife In Danger, Predators, Skyscrapers, Wildlife in Danger, Warships, and Ultimate Military Jets. You can see a list of all of the versions on the Wikipedia page.