The Words With Friends of Numbers
Yushino, a patent-pending social game of Scrabble with Numbers, fills a large void in social games. Sudoku is immensely successful, but it is a loner's game; this does not have to be the case. Words with Friends is the single most successful iOS app and Scrabble has withstood the test of time, but these can only be played with english speakers. Number games have larger potential than word games since they do not have an implicit language barrier.