Gameplay
Vortex is similar to Breakout, in which you use a ball to destroy bricks. However, the bricks are arranged along the inside of a cylinder. You use the click wheel to move the paddle around the cylinder to control where the ball goes.
The paddle now is slightly curved, conforming to the game's circular outer wall. The ball moves slower as it approaches the cluster of revolving bricks and faster as it moves away. The effect, if you like, is that of planetary gravity, except in reverse. The ball's trajectory and speed – whether traveling toward or away from the cluster – is continuously influenced by the pulling forces of the outer wall. The angle at which the ball strikes a brick, or bricks, also has an impact on its direction and, usually to a lesser extent, its speed. The speed of the paddle upon making contact also has a subtle influence on the ball's path.
As game levels progress, the size of the cluster grows and the number of concentric circles comprising it increases. In the early moments of each higher level, the empty ring between the brick cluster and the outer wall grows smaller, a confinement that necessitates quicker paddle movement.
To pass the level, all destructible bricks must be shattered. Adding to the challenge, there are bricks which "retract" for a time, enabling the ball to pass through instead of shattering it. Certain sets of bricks also move around the circle. Other bricks take multiple hits to shatter. Steel bricks are almost indestructible, unless one hits a dymamite brick next to it, but are not required to complete the level. Dynamite bricks (indicated by red dots) when hit will take out several other bricks with its explosion but are also not required.
Read more about this topic: Vortex (i Pod Game)