On my computer it is fine but once my game has been built when they play it they have often shot forward at insane speeds straight through the wall why is this happening? can anyone help with this problem?
Is there a big difference between FPS on your computer and in the final build? Maybe you are calculating physics in Update, which is frame rate dependant. Move such code to FixedUpdate, or correct for frame rate by multiplying all physics call by time.deltatime.