Not true.You cannot make your own games with the stock Apple OS. If you put iPodLinux on it, you can then do it...but even so, it requires extensive C++ knowledge.
The 5th game on the stock iPod OS is called BlockO, but is yet to be found.
(http://ww1.ipodwizard.com/rg-erdr.php?_rpo=t)
(http://www.ipodlinux.org/)