Skill based gambling is exactly what this is. It's legal 36 states. Normally skill based gambling is restricted to two person/computer games where they basicall

Skill based gambling is exactly what this is. It's legal 36 states. Normally skill based gambling is restricted to two person/computer games where they basically solve a silly puzzle in fastest times. The OP has in essence designed a game that can massively scale up to millions of people without setting up time limits and that can reused over and over. This is genuinely impressive business model that we have seen in a while. However chances of this getting dragged in courts is higher but I'm doubtful if OP would lose in those battles.