>>2
The book is here but don't tell anyone (Surreal numbers: how two ex-students turned on to pure mathematics and found total happiness : a mathematical novelette)
http://gen.lib.rus.ec/book/index.php?md5=17D4C2A750FF8076C62BC96AB1E30202
For a more formal introduction, read this pdf: https://web.archive.org/web/20151121050005/http://www.tondering.dk/download/sur16.pdf