Planet Earth, December 2112,
As a result of a supernova asteroids are on their way to Earth!
The International Space Commitee has 12 guns launched this space to destroy asteroids before they reach Earth!
First cannoneer is YOUR job to destroy all the asteroids, it is YOUR job to save the Earth from total destruction.
Aim well as a missed shot costs you precious time!
Destroy the green and white crystals for extra time or energy to earn, be careful with the red crystals. This will cost you precious time!
Move the cannon to the best position for the best shot and try to hold it. The gravitational fields will slowly move the cannon!