On the Sam's Commodore Site you can find a collection of .crt files. The data in these files are games that are converted to be used in a cartridge. On the web page you can also find information on how to burn a EPROM and a schematic for building your own cartridge. A few examples of the .crt files are: Bruce Lee, Boulderdash, Super Zaxxon, Beach Head, Ghostbusters, Ghost 'n Goblins, Gryzor and many others.