What ingredients does a game publisher look for in order to create a blockbuster, triple-A title? Sometimes, as it turns out, exactly the same ingredients that can make a film company eager to greenlight a blockbuster $125-million movie.

Take a few fire-breathing dragons, add the warriors who ride them plus a pinch of swordplay and a huge mythological universe, stir, and you've got Eragon. It's a concoction that will be released to game store shelves on Nov. 12 and then to the big screen four weeks later on Dec. 15.