CD Projekt has detailed the upcoming 2.0 update for the PC version of hit RPG The Witcher 2. As revealed in the video below, the free update brings with it technical enhancements, gameplay tweaks and major new features.

The biggest new features are Dark Mode and Arena. Dark Mode is a new difficulty setting that ups the challenge and adds a number of powerful 'Dark' items. Arena mode is just what you think it is, pitting you against endless waves of enemies while you pick up vital XP.

A new tutorial has also been added in order to help beginners through the early stages of the game.

The Witcher 2 2.0 will be available to download for free from September 29. All the new content will be included in the Xbox 360 version of the game due early in 2012.

We loved the game when it released earlier this year, awarding it 9/10 in our The Witcher 2 review.