Originally released as a pre-order bonus for Hitman: Absolution , this mission places Agent 47 on a balcony overlooking a rooftop party in Chicago.
Look for hanging crates, electrical panels, or gas canisters to trigger "accidental" deaths, which yield more points and don't alert others.
Successfully completing the mission and its challenges unlocks permanent upgrades (like the Kazo TRG sniper rifle) that carry over into the full Hitman: Absolution game. Modern Sniper Assassin Challenges