The game of Pig is pretty simple. Roll as many times as you want in a turn...but if you get a "1" (a Pig) you lose your turn (and any points earned in that turn). Your goal is to get to 100 points before the computer player (Comp) does. So roll away...then click on Hold when you are ready to let the computer play. See http://en.wikipedia.org/wiki/Pig_%28dice%29
Almost all credit to paddle2see. I just added some stuff.