Interesting change to the bonus game, though there's obviously something missing from the blogger's description of it. I don't see anyone picking 55 numbers off of a 75-number board for $100K.
Wait, wait, I think I get it. You start by picking a number out of the 15 in the "B" row. Avoid the wrecking balls, and you can risk what you've won for a pick in the next column. Go across all five, and you've got the $100K. Say, do we actually have a semi-interesting risk/reward bonus game of chance here?
If there are, in fact, 20 wrecking balls on the board, I'd imagine the distribution would have to go something like this: B-1, I-2, N-3, G-4, O-10.