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I'd be a terrible detective, says Holmes star Downey Jr

ROBERT Downey Jr was joined by an all-star cast at the European premiere of his new film, Sherlock Holmes: A Game Of Shadows -- but he admitted he would make a lousy detective.

The US actor reprises his role as the famed sleuth in the sequel, which sees his character reunite with Watson to battle criminal mastermind Professor Moriarty.

Downey Jr braved the rain outside London's Empire Leicester Square with director Guy Ritchie and co-stars Jude Law (Watson), Jared Harris (Moriarty) and Stephen Fry (Mycroft).

Despite portraying Arthur Conan Doyle's beloved creation with gusto, the former hellraiser said he would never hold down a position as a private eye.

"I tend not to exhaust myself thinking about details. I like to be creative instead."

But Downey Jr said the film -- which also features Noomi Rapace, star of The Girl With The Dragon Tattoo -- was not a typical detective drama.

"It's not [TV crime show] CSI. It's about the way that people think, the mistakes they make and the things that Holmes picks up on. It's a character-driven mystery," he added.