update, video: http://vimeo.com/13055285
I love the good old radiosity.
This is a small project. All lights baked and there is no light in the scene!
Maybe you dont believe but this can run on very small hardware like an iPhone.
The toon shader is a small old trick that I have learn from the very first BGE demos from Blender company: duplicate all geometry, flip normals and use alt+s to “fatten” the models then make the material black.
So the screens: http://etyekfilm.hu/house_bge/