No purchase necessary. Open to US. Participants should be at least 18 years old. Each person can only participate once.

1 winner of 1st prize will be selected randomly among the top 100 in the ranking. 1 winner of 2nd prize will be selected randomly among the top 300 in the ranking. 3 winners of 3rd prize will be selected randomly among all participants. Winners will be notified via email before 10/9/2019. The entrants with the same score, the earlier one ranks higher.