Speaking of developing games for it, how does that work? I see the word 'flash' mentioned a few times, is the author talking about the same technology people make games on the Internet with?
You're going to need to know either C or the architecture assembly (and probably both to do much beyond "hello world"). If you're not a programmer (inferring from your comment), there are some arduino game kits which are much more friendly.
A Forth machine is almost as amazing as a Lisp machine, and the language share some similarity in spirit, also (or maybe because) they are almost their exact opposites in almost all technical aspects.
(See e.g. http://en.wikipedia.org/wiki/Forth_(programming_language) for an overview.
"Forth is currently used in boot loaders such as Open Firmware, space applications, and other embedded systems.")