Welcome back to Day 8 of my 10 Days of Blockchain series—this is the episode where our decentralized Rock, Paper, Scissors game finally behaves like a real game. Instead of ending after one round, I update the flow so Alice and Bob keep playing under the same wager until there’s a clear winner. If the outcome is a draw, we loop back and play again, which means the only thing changing is the order of actions: Alice publishes wager + deadline, Bob accepts, then we enter the repeatable “submit hands until not a draw” section. The big concept I teach here is how to implement a while loop in Reach, because the language is normally constant/static and doesn’t let variables change—except inside these loops via variable binding. Since Reach does automatic verification, I also add loop invariants to prove what stays true before and after every iteration (like the contract balance staying at 2 * wager, and the outcome always being valid). Then we commit inside consensus, collect hands, reveal, compute the winner, and explicitly use `continue` to repeat. By the end, the contract always results in a payout (no more “stuck in draw” weirdness), and you’ll see it run through both a first-round win and a draw-then-win scenario. Next up, I’ll move us out of testing mode and into an interactive game with real users.