Here's a one page RPG I cooked up in an hour or so. The characters are regular folks who have just sat down for breakfast at the local diner when the TV or radio begins airing a public announcement about an impending tragedy befalling their local area, or even the world, and they have 24 hours to try to stop it. If they don't fix it, the One Day starts over again (ala Groundhog Day) back at the diner, and the characters have to try it again. The characters remember what they tried before so they can make decisions based on prior knowledge.
Don't know how much fun it would be in actual play, but I just had to get it out of my head. The file has two pages, but one would be a "cover" with the thing being printed front and back on a single page.