The concept behind GoogleEarthing.com is very simple: imagine a scavenger hunt akin to Where’s Waldo whose search space consists of the entire visible surface of the Earth. Seriously.

The rules of the game are very simple:

1. Download and install Google Earth.
2. Identify the location of the image by name, longitude and latitude, or very specific description. Enter your guess using the comments feature for the image in question.
3. Send an email to info@googleearthing.com so we know how to contact you.
4. Tell all your friends about GoogleEarthing.

The first person with the correct coordinates, name, or otherwise completely specific description of the location will will a valueless prize chosen by the site operator.

Just for grins, here’s an idea of the sort of image you are tasked to find:

The above image is actually puzzle #92, posted November 12, 2006. As of this blog entry, this puzzle has not been solved … will you be the first to crack it?

KenKen, which began appearing in The New York Times in February, is a new numerical logic puzzle from Japan. The name means loosely “cleverness squared.”

KenKen shares some properties with sudoku. Each is a pure logic challenge in which numbers are filled in the squares of a grid. Unlike sudoku, though, in which the numbers act solely as symbols (letters or pictures would work as well), KenKen requires arithmetic.

The rules are simple: Fill the grid with digits so as not to repeat a digit within any row or column, and so the digits within each heavily outlined box (called a cage) go together using the arithmetic operation shown to make the target number indicated.