Tips:

• Always lead the incoming missiles by firing ahead of them and try to time your explosions so that they can trigger a chain reaction.
• Sometimes it's worth sacrificing a city just to keep the others alive. Spread out too thin and you can risk losing everything.

Requirements for Ground Zero:
Ground Zero requires that you use a Java enabled browser, such as Netscape Navigator 4 or greater or Internet Explorer 4 or greater. For additional questions, check the support page.