The three shots and coasters are set-up in a tower with a shot glass on the bottom and a coaster on top. The first player begins by rolling the die. If he rolls a 6, he takes the top coaster off. If he doesn't, the next person rolls until the 6 is rolled. This continues down with a 5, 4, 3, and 2, each time either a coaster is taken off the tower or a shot is taken. In a bar, the unlucky person that rolls the 1 must pay for the next round. Or you can just play down to the 2.