The current and fourth level of challenges may require more than observation skills to solve. The need for a real technic will appear as the levels go up. As usual you have to bring the wheels to the same configuration as the original one.
Original configuration
In case you get lost after making wrong moves, you can reset the two wheels to their starting positions using this button:
After you have done all the cases of level 4 you can give a try to the level 5.