Penghapusan gembira, berapa tahap yang boleh anda lekatkan?
The development of science and technology has brought a lot of negative effects. Among them, smog is one of them. It brings great harm to people's lives and is a common topic all over the world!
Based on the idea of smog, eliminating the number to clear the haze, hoping that through everyone's efforts to return to the future blue sky.
Presented in a level mode. The more backward the number, the more difficult it is to clear.
Operational skills are also very important.