Bollywood star Hrithik Roshan, who has stepped in the shoes of legendary Amitabh Bachchan in upcoming 'Agneepath', says the remake version of the 1990 action thriller is the hardest film he has done till date.

Hrithik, who made his grand film debut in a leading role in 'Kaho Naa Pyaar Hai' in 2000, will reprise Bachchan's iconic role Vijay Deenanath Chauhan.

Asked whether'Agneepath' will change his image as an actor, the 38-year-old says, "This is not in my hand. We are doing everything possible to make the film a success. I don't believe in an image change.

I only do films that I like and never think whether or not a movie will change my image." "In case of 'Agneepath' I feel it is the hardest film that I have done ever...especially the climax scene.

I can t talk much about it; you all must go and see it," said Hrithik, who tasted success last year in 'Zindagi Na Milegi Dobara'.

'Agneepath', a remake of the Mukul Anand-directed Hindi film of the same name, is produced by Karan Johar and helmed by Karan Malhotra.

The film, which will hit cinema houses on January 26, stars Priyanka Chopra as the female lead, while Sanjay Dutt would play the villain's role, originally essayed by Danny Denzongpa.

"She (Priyanka) is a superb co-star and a very special person. She is the best person to work with. When she is on film sets, the environment turns very positive," Hrithik added.