We just completed the next version of Big Bad Sudoku Book for iOS4.2, which will add game center and background support to the iPad version of the game. BUT - the OS isn't out yet. So in our boredom we decided to give away 50 codes of the current version, which still supports GC on the iPhone, and can be freely updated when the 4.2 does come out. Whatever! Here's a link to the popular game on itunes: http://itunes.apple.com/us/app/big-bad-sudoku-book/id364907966?mt=8 The codes are posted on the Bad Weasel Support Forum: http://badweaselgames.com/forum/topic/50-free-download-codes-for-big-bad-sudoku-book#post-38 Thanks all! Please enjoy!