Click on all the squares that don't contain a pig.
Click on a square to start. If the square contains a pig you lose. If it is adjacent to pigs a number will appear in the square telling you how many neighboring squares contain pigs. If it doesn't contain a pig and there are no nearby pigs the surrounding
squares will be clicked.
To mark that a square contains a pig click it and hold down for a half-second, the square will turn pink and the pig counter will decrease.