Actually a set of contracts, but contract.sol is the main one. Very simple multiplayer game. Anyone can place any amount of money in the contract; the first half of the money taken out comes out at a 10% loss; the second half at a 10% profit.
Ensure you're running on the testnet. Ensure index.html doesn't have the line setting the defaultAccount to the 0x0037... address. Navigate to the index.html. Play.
Deploy to your network using your favourite means of deployment. Ensure you alter the 0xf56a... address in the contract to the newly deployed contract address. Do as above.