Your only aim is to reach 10,000 points. The player has to cast the dice, keep the ones with points on them and cast the ones that got no points again. You can stick at any time if you think you got enough points and don't want to risk losing them all. However, if you get three following blank moves, you lose 500 points.
Number '1' is worth 100 points, number '5' is worth 50 points, and threes are worth 100 times the number on the dice (unless the number on them is 1 – in this case, they're worth 1,000 ...