The Def Guide to Zzap!64

I've changed how the site keeps track of your game list perference, e.g. list most recent games or games beginning with D etc.

The preference is now stored in a cookie rather than on the URL (changed for Google SEO reasons).

This should make no difference to you but in case I've broken something else, I would appreciate it if you'd let me know if you discover anything weird on the site now, like your list preference getting "lost" etc.