Until relatively recently it seemed as if the Wii was to remain relatively free of "adult" titles. No More Heroes popped up in March last year, but for a long time that game was the sole occupier of a lonely and bloodstained niche in the market. This year things have changed. Over the last four months people have already had the chainsaw-tastic Madworld, a frustrating but passable Tenchu game, and the zombie bonanza that was HOTD: Overkill. Now, in the not-too-distant future, Nintendo's family-friendly console will be getting Dead Space: Extraction – a prequel to one of the grisliest games of 2008.