The Holland Play is the last Grand Theft Auto IV mission received from Playboy X and Dwayne Forge. Each wants you to kill the other, so you need to make a choice. Gameplay differs based on your choice. The reward received is also different based on your choice.

• Niko talks to Playbox X at his apartment. X wants you to kill his mentor, Dwayne Forge. Niko replies that he needs to think it over.
• Later, Dwayne calls and asks Niko to kill Playboy X. It is left up to the player who they will kill.
• When Playbox calls later, a red 'X' will display over Playboy's location, while a red 'D' displays over Dwayne's.
• Make your selection by proceeding to your chosen target's location. This mission does not affect Niko's story line and can be played after the game is beaten.

Dwayne Forge

• If you have decided to kill Dwayne, head to the projects of North Holland.
• Climb the stairs to his apartment.
• Take his bodyguard out with a headshot.
• Walk around the corner to come face to face with Dwayne.
• The execution is almost anti-climactic. Dwayne simply turns around, while Niko closes his eyes and takes hiim out with a headshot.

Playbox X

• If you have decided to kill Playboy X, head to Playboy's penthouse in Northwood, Algonquin. 
• A cutscene is triggered in which Playboy understands that Niko is there to kill him.
• Playboy heads to his balcony while his guards fight Niko.
• Take cover and shoot as many as you can from there.
• Leave cover in order to take out the rest.
• Exit onto the balcony.
• Chase Playboy onto the street.
• Take out any of his guards at street level.
• Continue to chase Playboy into an alley.
• When he drops his Desert Eagle, take him down with your handgun to trigger the execution cutscene.

Rewards

For the execution of Dwayne Forge, Playboy X will reward you with $25,000. However, he also does not want anything further to do with you for killing his mentor.

For the execution of Playboy X, Dwayne rewards you with X's penthouse, Claude's outfit from Grand Theft Auto III, and a Desert Eagle. Dwayne also becomes a friend if you respond correctly to his email. This means he will send two gangsters to help you out during fights.