An all day game? Have I lost my mind? No. The idea behind these games is to have something special to do over the course of a day (or maybe several days).
You play these games in the background of your life, while you go about your regular routine. They can really spice up a slow weekend or just add another dimension of fun to your day-to-day activities. Both are my own creation (although I'm sure other people have thought of them as well) and I really enjoy them a lot.
As always, if you know of any more, please let me know, and I'll be happy to post them here for everyone to share!