If you don't want all your files under /usr/local/games becoming executable, try this instead:
chmod -R 1775 `find /usr/local/games -type d`
This will only change permisions on directories under /usr/local/games. It also adds the "sticky bit", ensuring that only the owners of files (or root) can rename or remove them. Like trickykid said, go read those manual pages.
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