Valve, the creator of Half-Life 2 has announced that it will be releasing an expansion pack of the popular game.

Called Half-Life 2: Aftermath the expansion pack will let players continue where the last game left off.

The game expected to be sold online and delivered in the same way to Half-Life 2, ie as a download.

It is not clear yet whether or not a boxed copy sold on the high street will be available. Expect a summer release.