Stanford
Based on the infamous Prisoners versus Guards experiment, you play to either win by having the most of your characters (either prisoners or guards) OR by spelling out your team word (LIVE or EVIL). Cards are laid horizontally, and can be laid on top of each other. This is a game of high strategy, as you need to keep track of a number of factors if you are to have any chance of winning.
You can read the rules of the games here.
Buried Puzzles Included
You read that right - each mini-game has a puzzle buried within it - which vary from the elementary to the head-scratching. There is a delightful game-related mental reward when you solve each of the puzzles contained within each game.
Wallet Plus Cards
These are quite simply the most versatile card games - housed in their own wallet, they can fit comfortably into a day bag, rucksack, suitcase or lunchbox.