In cowsweeper, you play the befuddled cow, trundling through a grid of Cambodian boxes. Being a cow, you have no interest at all in finding out where the mines are, but the field does have some good clumps of grass. You begin in the corner of the field, and step square by square (diagonals are OK), until you eat all of the grass in the field. Then you can take a nap.
However, it is a minefield, and cows, unlike cats, only have three lives. Your cow senses tell you how many of the eight squares around you are mined; this number is listed as the `threat' of the square you're on, at the top of the screen. After you step off of a square, the square's threat is listed on the square itself.
That's the life of the cow. Now go get some grass.