So far my design document consists of two pages. Writing this made me realize that it’s pretty difficult to convey a game concept with just words. I wrote down the game concept, the art style I’d like to achieve, the game modes and my influences for the design. For this puzzle game I would say my biggest influences are Picross, Tetris and Quarth. You get as much out of the design document as you put in and so far I think what I’ve got is enough to get me started.
Another approach I’m going to be trying is to draw out the game components onto flash cards. I’d like to see if I can get a mock-up of the game going on paper for someone to actually play out/solve. On the implementation side I’ve set up a Subversion source control repository and installed the new XNA 3.1 which was just released.