This game is for Mac and Windows however due to Atari’s copyright of the pong game the game is now taken offline but you can find it if you search around, with the new iPhone 3GS’s graphics power this game would look great on the iPhone.

You would control your side using the touchscreen and to shoot the plasma you would slide your finger forward, it would be multiplayer as each user can use one side of the screen or even over WiFi or Bluetooth.

I did email the developer about it a while back but never recieved a reply so I might try again.