I'm developing a small web game where users can win a bit of bitcoin, and I've wanted to make some part of it handled by a blockchain. After reading some articles about building games using Ethereum though it sounds like once you publish your code/game you can't change it without introducing a new version of the game which would mean the old one is still kicking around on the network, they had compared it to the idea of cartridge games (no updates). So my question to you is how would you handle dynamic reward structures?