"double drop is a fast paced minimal looking action arcade game inspired by long nights out in Tokyo, designed specifically for the iPad." - Author's description
Why play it? If you've ever enjoyed the simple delight that is playing pachinko then you'll love double drop. But it's much more than a digital version of pachinko due to the introduction of a second player.
You each drop your balls from either end of the iPad into the cluttered space between you. The idea is to collect triangles with your ball and take them to the opposite side to score. But if one of their balls collides with yours they'll steal your triangle.
It adds the need to read your opponent, and if you're playing with two people on the same device, you can probably expect some silent stand-offs, and then fits of giggles. - Chris
Official website (Seriously, check this out)