I made a game but the problem was that I couldn't see any shadows. I researched online and found out that
GLSL must be selected. I did this but then everything appeared completely white.
I did some more research and found out that I have to bake (even though I have no idea what baking is). I did so but my tank and my sky box still appeared white.
When I tried to bake them, Blender said "no object or image to bake to". Even the walls that are baked don't show any shadows and yes, I do have a sun.