Is architecture art? Look at it this way: It is fundamentally constrained by not only the laws of physics, but building codes and the prosaic demands of those who have to live there. (Well, Frank Lloyd Wright could probably claim to have shaken off those constraints, but he's off to one side.)

It is different from sculpture in that the artist does not have a free hand, much like the video game creators don't have a free hand compared to novelists or even cinematographers (who are limited compare to novelists and painters but not as much). Limitations are the bane of choice, and choice is the fundamental aspect of art.