* Gay Tony is a drug addict, and Luis needs to do him some favours in order to get him out of debt. However, "his drug problems get worse and Tony gets more and more out of control," says Rockstar's Dan Houser.

* During one mission, Luis parachutes from a helicopter onto a glass-windowed skyscraper. Inside he blasts his way to his prey a few floors below and shoots his target, who then topples out of the bullet-ridden window. Luis dives out after him, wearing a parachute that glides him to safety.

* In another mission, Luis drops on to the top of a moving subway train from a bridge and unhooks one of the cars for a maniacal high-rolling collector of one-of-a-kind artifacts. A Skyhook chopper airlifts the freed subway car away.

* Luis is torn between friends and family and his quest for power and riches. But as he climbs higher in Liberty City's social circles, he discovers that the upper crust has some issues.

* Rockstar want the game to feel more action-packed, more crazy and more ridiculous than previous GTA IV content.