Kane & Lynch: Dead Men

All you need to do to win a round is end up with the most money. There are a number of ways to do this: you can be the only merc to get to the getaway van; if you have lots of cash you can become a traitor and keep all of it to yourself (providing you manage to stay alive and get out). You can also win the round even if you all end up dying - just make sure you pick up a few finders' fees.

Remember, if more than one of you gets out and splits the money, you won't win the round as it's a tie.