When iQCash was getting close to 1 million puzzles solved they had an airdrop of waves tokens. I can’t remember how much. It was based on the number of iQCash tokens you had. I had about 2500 at the time. Can’t remember how much I got. But, it was free so. Pretty sure it was between 0.01 and 0.1 so not a bad reward. 🙂
Perhaps they will have another Waves airdrop at 4 million or when the hit 2nd level puzzles.