The full Spelunky on Spelunky

A great article by Derek Yu about how Spelunky on XBLA came to be. 

Check out the article on Derek's blog, here:
http://makegames.tumblr.com/post/4061040007/the-full-spelunky-on-spelunky

I also recently read a book about Spelunky, written by Derek Yu, which felt like an in-depth version of the above article. You can get the book from here:
https://bossfightbooks.com/products/spelunky-by-derek-yu