When the time-limited mode and leisure mode are cleared, you can open the hidden level: the hidden level can be divided into time-limited mode and ordinary mode, and there are 48 levels. Some levels are some feeder passes, and some are difficult versions of ordinary passes (difficult versions of ordinary passes: some things will not destroy you in ordinary passes, but they will destroy you in difficult versions of ordinary passes). Six hidden objects can be found in the branch pass: young doctor, old doctor (hidden 1-7), worm (hidden 2-8), gray clay (hidden 2-9, 3-1, 6-5), square tile and rectangular tile (hidden 4-1).