Your objective is to kill as many people as possible without being caught. You can use almost any type of object in any way to take out your targets. Some NPCs can fight back though, so be careful. When you are satisfied with your kill count, you also need to escape so that the police don't find you. Make sure that when your ready to retire, you have an escape plan.
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If you log in before playing, you'll be able to save your progress - which means you can come back later and pick up where you left off.