1. You need to defeat all the enemies in the Flower Dance Xun Mei, open all the routes on the map and get the choice of numerical order (if you choose the wrong one, you can't open the hidden level).
2. The order of defeat is-Xiaowu-Dai-Xu-Beibei-Ji-Huo.
3. Fill in the selection number in the nine squares in turn: 3-5-7-8- 1-6.
4. After the number is collected, you can fill it in from left to right. Make sure to fill in all the letters here, that is, the diagonal line and each line add up to 15, that is, the first line 492, the second line 357 and the third line 8 16.
6, open the hidden level challenge: Bibidong, Luo, get the defeat reward.
7. Numbers should be filled in from left to right, and the sum of each row, column and diagonal is 15, so as to complete the challenge.