Once Upon A Time

How:

Cards, friends, minimal table or floor space.

What:

Story telling collaboration with surprise theft of narrative control and awesome ending phrases that each is trying to work towards.

Who:

Children, adults, and anyone who likes taking random, disparate elements and weaving them into a fairy tale style story.

Where:

Your friendly local game store, or Amazon has it ($24).

Why:

This one crosses all age groups, getting to our storytelling instincts very effectively. I played a ton of it in high school, and just recently recommended it to some older friends to bring along for a visit to some family with children. Kids get this quickly, adults can jump in easily, since the rules are light and the replayability very high. Plus it's small and portable.

Hearthstone (Blizzard)

How:

Free download (via Battle.net) for Mac, Windows and iPad.

What:

Turn based, one-on-one collectible card game using Warcraft universe and a mix of monsters and spells.

Who:

Play if you like deckbuilding strategy, human vs human multiplayer, sealed or constructed deck play and class-based differences.

Where:

Free download from Blizzard.

Why:

Hearthstone is easy to pick up, especially if you've played card games like it. The deckbuilding offers a variety of valid strategies and you can earn and unlock a variety of cards as you play more and more. For those who want a completely free experience you can earn in-game money through quests and participate in sealed deck Arena play, which is similar to Drafting in other games.