The School of Computer Science at the University of Castilla-La Mancha has released material from the first edition of the Course in Game Development. The material, consisting of 4 books over 1,200 pages in total and multiple source code examples, is mainly based on open standards and technologies. Almost all of the examples of the course have been developed on GNU / Linux. You can download books for free on the course website (PDF format). I have not seen it yet (lack of time), but it have a great looking. Only for Spanish speakers...

is this spam?

I don't think so. The books can be purchased but also downloaded for free and there is real content in them, not things like "To program games, you need to learn game programing, please enroll our courses so you can fill the intentionally-placed gaps in the books".

Why spam? Do you have follow the link? It's the website of a university in Spain UCLM

http://www.uclm.es/

This is a course in game developping. Or at least it seems to be so. The content of this couse have been written in four books that can be downloaded as pdf as well as several code for them, GPLv3 license if I not wrong. There's no need to buy them, what more do you want?:

http://www.cursodesarrollovideojuegos.com/cedv/M1.pdf
http://www.cursodesarrollovideojuegos.com/cedv/M2.pdf
http://www.cursodesarrollovideojuegos.com/cedv/M3.pdf
http://www.cursodesarrollovideojuegos.com/cedv/M4.pdf

I have not seen them yet, but they have pretty good looking. Just I though it could be in interest for someone... spanish speakers as I can see.

man, most games leave one bewildered and ignorant.. focused on weak and hostile sighting and fingering. one of the best games I played that can be lively, ongoing and one applies clarity of mind to is... the linux operating system. Chess is good too.

What games have any real value?

KevinN,
transport tycoon deluxe =)