Quarterpuck
(requires three same-sized coins, preferably pennies)

Setup:
Sit on either side of a table or flat playing surface. Three feet apart is a pretty good distance for this one, but as you play you'll get a better feel for what distance works best for you.

Give the coins to whoever is going first - that person is the "shooter". The other player (the "defender") forms a "net" with his hands. Form the net by placing your forefinger and pinky straight out (and as flat as possible) on the table. The rest of your fingers can either be balled up or hanging off the edge of the table. The "net" is the area between your forefinger and pinky.

The shooter places the three coins in a triangular pattern on the table a couple inches from his or her side of the table. The quarters must all be touching each other. You probably want to have the flat side of the triangle be facing the "net".

Play:
When you are the shooter, sharply tap one of the quarters with your forefinger - not directly down, but towards the other two coins and down. This will drive the other two coins forward and apart. Now, you're dribbling. The goal is to move the coins across the table, and knock one of them into the net. You move the coins by knocking one coin between the other two coins. It doesn't matter how far apart the other two coins are, and it doesn't matter which coin you decide to hit each time. Push a coin so it slides between the other two (bouncing off one is acceptable). As long as it goes between them, you can keep moving.

If you are unable to slide a coin between the other two, or if you miss (the coin doesn't go far enough or doesn't go between them), you become the defender and the other person becomes the shooter. The shooter plays the coins from wherever they are on the table.

You get a point when you push one of the coins into the opponent's net. After a made shot (or one that goes off the table), the defender becomes the shooter, starting with the triangle formation on his or her own side of the table.

Variations:
Require at least three "dribbles" before shooting. This prevents one person from getting a lucky break in the beginning and making an easy shot.

Skills:
While physical skills matter in this game, it's more important to plan ahead. Each time you hit a coin, you're building another triangle that you're going to have to move through. Believe it or not, sometimes going backwards makes a lot of sense.