(The Coin Age coin purse shown here was a separate purchase I made and is not included with the game. But it's a keen carrying case for everything!)
Coin Age is played on a single world map about the size and shape of a credit card. If you already know the rules, you can stick the board in your wallet and -- with $1.56 in change -- you can play this game anyplace. The Coin Age Kickstarter bundle came with a bunch of additional stretch goals, but the only thing required to play is the map, the rules, and a handful of coins.
Once the last area is covered, or someone's coins are all used, the game ends, and the points are totaled. Here, silver wins with 25 points, barely beating gold's 20 points. Scoop up the spare change and play again. A game takes about 5 minutes to play.
Coin Age was just sent out to the Kickstarter backers, though Tasty Minstrel had copies available at Gen Con, so I'm uncertain of the commercial availability at this time. (A few overpriced copies have popped up on eBay if you feel like paying triple.) But once you can get your hands on this clever little game, I suggest you grab it. You never know when you might find yourself with some downtime, a handful of change, and a conquering opponent!