Modeling for Game?

I have a problem in modeling a track for a ball rolling game. I was studying the BGE but I got this problem with the track. I tried to recalculate normals but it still happen.
I have already finished the track and tried to look at it in Game mode.

This is the track before i press P
And the track after…
[ATTACH]54465[/ATTACH] :frowning:

i don’t know if this is the right place to post this, but can anyone help me? :frowning:

I think that might be because of your light. Try adding more lights and then going into shaded mode and hitting the P Key and see if that helps. I don’t think it is a normal problem, otherwise you should be able to see it in the 3D view. game engine but it go to move

press W> flip normals i think that might help