My First Raspberry Pi Game -- Part 11 -- Being less rude

Andy Balaam shows you how to write your first ever computer program on the Raspberry Pi ultra-cheap computer. This episode: we fix some bugs, so that you can close the game whenever you want to, and we mention the concept of exceptions. There are detailed notes at: http://www.artificialworlds.net/blog/2013/01/11/my-first-raspberry-pi-game-part-11-being-less-rude/