From the Publisher's website:
"THAXX features a solid oak ship's plank, authentic replicas of the Elcazador's Lost Treasure and a historical game in which you attempt to plunder the loot of your opponent. The game of Thaxx seems as though it was ripped from the deck of the great ship and into your hands. Thaxx is easy to learn with fast paced game play for ages 6 and up."
On your turn, you roll the dice. You either add a coin to the number on the board that is the sum of the dice or add two coins to the respective numbers. (e.g., if you roll a 2 and a 3, you could place a coin on the two and a coin on the three, or place a coin on the five)
You may also use one of the numbers to remove one from your opponent's board and place it on your own. (e.g, take from your opponent's 3 and put it on your two).
There are no sixes, sixes do nothing. In fact, rolling double sixes requires you to remove one of your own coins. Otherwise, rolling doubles allows you to go again.
The first to cover all his/her numbers wins.