A bit complex but you can know the layout in early from its entrance. Here is the full post: http://desho.wp.xdomain.jp/51/ (but in Japanese.)

I posted images of all layouts in this topic, so perhaps you can find the rule.

for TL;DR and English speakers:

• Go left-down or right-down if possible.
• Imagine the true route is "S" or "Z." No more corner till finding the ball.