Only days after storming it's way to number one in the PC sales chart, Operation Flashpoint is set to bring upgrade packs to download - completely free.

The packs will include more weapons, vehicle and missions, and are set to allow the game to grow each month from July to September, at the Operation Flashpoint website.

In the first pack, there will be two new vehicles, one new weapon, two new official single missions and another five official multiplayer missions to the military simulation. August's pack will include full support for the remote/dedicated servers for online multiplay, plus further new weapons, vehicles and missions. A mission editor is also expected to be included in the pack.

Operation Flashpoint, is published by Codemasters, and is available now for the PC - we'll be having a full review of the game on GamesPaper in the next few weeks. Buy Operation Flashpoint from Amazon.