http://home.pinknet.cz/~coyot/btd5/btd5d_ch.php ^^ text walkthroughs, and other useful info

https://www.youtube.com/playlist?list=PL1tXOQa6EdYoLgis1ar7HZcZLtJ2RiSRG ^^ video walkthroughs

You can google the name of the random board, and get several walkthroughs on