Tokens and leaderboards
Create a multi-step "hard game" that might take even a year to figure out. Have a leaderboard page that to start has basically nothing, but as soon as the first token is found by the first person (which is the reward for solving the first clue) you get a token and a time-stamped "You were first".
This immediately goes up on the games leaderboard page, which now shows the token that is being searched for, which addresses got it in which order and let people claim their addresses.
Token 1 is clue #2, the name is a hint of how it can be used and the solution the the clue is sending the token to the correct address, which then sends back token #1 and also token #2
As before, token #2 is now listed on the leaderboard
Token #2 is clue #3, the name is a hint of how it can be used and the solution to the clue is sending the token to the correct address, it could also be sending both token 1 AND 2, which then returns 1, 2 and 3 if you sent it to the correct address.
Token 3 added to the leaderboard, repeat until conclusion.





