HOW TO PLAY:There are as many ways to play as there were cultures that used them. The basic concept is the same throughout. Each bone can land on one of four unique sides, with unequal probability. Print four copies for Roman rules, more or less as needed for other games. See this article on Roman Board Games for the Roman rules  [http://www.aerobiologicalengineering.com/wxk116/Roman/BoardGames/tali.html]. For a comprehensive history and rules of many games played with knucklebones, see the Wikipedia entry [https://en.wikipedia.org/wiki/Knucklebones]. This paper  [https://ladyofbones.files.wordpress.com/2013/06/astragaloi-handout.pdf] by Jenna Mortensen is a great summary of how these bones were used for divination. Images are of a nylon laser sintered version, which feels and bounces just like real bone. Available from my Shapeways store: http://shpws.me/Kd2v