Object: To capture alien spaceships and cover the greatest area with force fields.

Set-Up: The game board is of a 20 × 20 grid. Initially, the grid is occupied by five spaceships.
More spaceships are added as the game progresses.

Play: On each turn, the engineers from mission control will provide you with four numbers.
These numbers represent the perimeters of various force fields that you can create. On the grid, create a rectangular force
field with one of the given perimeters that surrounds as many spaceships as possible.

Points are based on the number of spaceships you capture as well as the amount of area you cover.

You'll earn an efficiency rating for each turn, which is based on the maximum possible area that you could have covered.
The closer your area is to the maximum possible for the given perimeter, the greater your efficiency rating for that turn.Your
overall efficiency rating is an average of your efficiency rating for all turns. At the end of the game, you’ll get a bonus
based on your efficiency rating.

So, it might be in your best interest to capture fewer spaceships but cover greater area to boost your efficiency rating.

Winning the Game: The game ends when all spaceships have been captured, or when it is impossible
for either player to make a move. The winner is the player with the most points.