Thanks to urban_bohemian I have discovered...
The Sand Game
Mesmerizing. Entrancing. And a complete waste of time. YAY WASTES OF TIME! I managed to get burning oil and growing water to burn out and rejuvenate on a regular cycle. :D
Edited to add: Here's a version with zombies!
Edited to add: Another odd one - Balldroppings Talk about a waste of time. :D