Meltdown is a mission in the game Grand Theft Auto IV. Lucas has stolen diamonds from Ray. Ray asks you to kill Lucas in Castle Rock Gardens and retrieve the diamonds.

1. Character: Ray Boccino
2. Reward: $9,500
3. Unlocks: None
4. Achievements: NoneWikiCheats: Grand Theft Auto IV Walkthrough

1. Don't bring a nice car to this mission because you'll lose it.
2. Don't worry about shooting at the target, just follow them until they crash.
3. Use the sniper rifle to take out the enemies when they scatter.WikiCheats: Grand Theft Auto IV Walkthrough

Niko Bellic is introduced to Ray Boccino by Packie McReary. Ray is a low-ranking member of the Pegorino crime family. Ray eventually helps Niko track down Florian Cravic and gives him a number of jobs, mostly surrounding diamonds. Near the end of the game, Niko is ordered to kill Ray because the mob boss thinks he's a rat.Wikipedia: List of Characters in Grand Theft Auto IV

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  Lucas has stolen diamonds from Ray. You have been asked to go to Castle Rock Gardens, kill him, and retrieve the diamonds.

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  When you find Lucas, a car chase will ensue. At this point in the mission, you're merely trying to stay with him until you get to the park, at which point a cutscene will occur.

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  After their car crashes, Lucas and his party set off on foot, running into the park.

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  Take cover behind the pillars to the right. From there take out the enemies hiding behind other pillars up ahead. After they're down, make your way under the bridge straight ahead. The enemies here will most likely be right out in the open. If you have body armor, it will come in very handy. as there is no cover available. Charge straight ahead under the bridge while firing aggressively.

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  After that, you simply need to find Lucas, by shooting open the bathroom doors. Once he has been killed, meet Ray at the park bridge to deliver the stolen diamonds and successfully complete the mission.

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  Award: $9,500