I can't find the controls anywhere. I've checked the plane, and the surrounding area, but I can't find them. They must be right in front of my nose, but I don't see them.
You can simplify the game and make adding more levels and hallways easier by removing the onCollides controllerAcc scripts from the boxes, and putting this into the onCollide of the Character:
No, it is only a change in the speed of light. In the game, the speed of light is inf m/s, which is, of course, inaccurate. If you are simulating something like light bending because of gravity, the light at inf m/s will not bend. If you change the speed to 3.0 x 10^8, it will act as normal light does, and bend.
The inf m/s thing is probably there so that if you are using lasers to activate some script, the light won't bend.