GTA 4 has sold over 15 million units

Approximately two million units sold over the last year.

Take-Two has announced that Rockstar Games' Grand Theft Auto IV on Xbox 360, PS3 and PC has now sold over 15 million units worldwide.

A year ago the publisher announced it had shipped over 13 million copies of the game, indicating that approximately two million further units were sold during last year.

Take-Two also re-confirmed the March 30 release of Grand Theft Auto: Episodes from Liberty City for PS3 and Games for Windows - LIVE. The Lost and Damned and The Ballad of Gay Tony will be available at the same time for digital download.