In addition to the re-release of Fresh Games’ Cubis 2, a fifth-generation iPod Game originally sold in 2006, the iTunes Store today added Electronic Arts’ Yahtzee to the roster of downloadable games available for the third-generation iPod nano, iPod classic, and fifth-generation iPod. Cubis 2 is a block-matching game with colorful backgrounds and user-selectable artwork, while Yahtzee is billed as “America’s all-time number…