Obt miner

1. Fishbone mining is an old mining method, which is to dig a mine (2 or 3 grids high), and then open a new mine every 2 grids. This way, the efficiency is very slow, but each of these layers will not be missed

2. Should it be a cash coupon? If you click "mine", the page will have three words of cash coupon. You can see the usage of cash coupon. When you check out your proct, click to settle. The page will show the options of using cash coupon and red envelope. If you click the cash coupon you want to use, all your existing cash coupons will come out. Just choose one.