Rules

• Use the letters a,s,d to immediately fire from the respective silo. (This is the best technique.)
• Use the numbers 1,2,3 or the letters z,x,c to select the active silo;
• Use the space bar to rotate the active silo. In this case, only active silos are considered.
• A mouse click will then fire from the active silo.
• You may not target below a certain level.
• Some cities (the bigger ones) can withstand more than one hit.
• Some enemy missiles may MIRV. Those which mirv into more than two warheads are bigger and in cyan.
• You score 1 point per exploded warheads multiplied by level, up to 100 max.
• Surviving cities earn 100 x level each (no max).
• Bonus cities every 20,000 points.
• A Bonus Level (Challenge wave) every 5 levels, where a bonus city is awarded for each surviving city of the bonus wave.
• Bonus cities are randomly placed into empty slots.
• Game over when no more cities left.
• Watch out for smart bombs and satellites.
• When a plane is destroyed, a package is dropped. If the package safely parachutes to the ground, a special weapon is awarded.
• Click on a special weapon icon (the right side panel) to use it. Objects destroyed using a special weapon do not earn points.
• The special weapons are:
  • A shield. It lasts about 10 seconds, and destroys missiles and smart bombs on contact.
  • +10 missiles for each active silo.
  • 10 rebuild: rebuilds a silo with 10 shots where there is no silo.
  • big shots: the next 10 shots will explode with twice the usual radius.
  • splitting shots: the next 10 shots will split into a pattern.
  • A laser: Kills all missiles, smart bombs, and satellites instantly.