Plank is an interesting puzzle game for the iPhone and iPod Touch. In Plank, you use the accelerometer to shift which way the marbles roll. Your objective is to make lines of three same colored marbles to clear them from the board before the plank breaks under all the pressure.
Plank is definitely an interesting game to say the least. As you turn your iPhone, the plank shifts which way it's leaning and rolls all the marbles in that direction. You can stack marbles on top of each other or side by side, but once a marble makes contact with another one, they stick together and can't be separated.
Besides marbles, there are other random pieces that fall onto the board. While lining up three marbles horizontally only removes those three, doing it vertically takes out the entire column. This can be very useful if you get stuck or get a weird combination and can't easily clear it. You can also use the random bombs that fall and your set number of shakes per level to clear marbles off the board as well.
Plank is an interesting game that is definitely unique. Unfortunately the game feels kind of slow as the marbles fall at a set pace. Granted, as more start to fall it picks up a bit, but to start it might frustrated some people.