The object of Greed is to erase as much of the screen as possible by moving around in a grid of numbers. To move your cursor, simply use your arrow keys or the the 'wedcxzaq' keys. Your location is signified by the ! symbol.
w = Up | e = UpRight | d = Right | c =DownRight | x = Down | z = DownLeft | a = Left | q = UpLeft
When you move in a direction, you erase N number of grid squares in that direction, N being the first number in that direction. Your score reflects the total number of squares eaten.
Greed will not let you make a move that would have placed you off the grid or over a previously eaten square. If no valid moves exist, your game ends.