Bollywood star Hrithik Roshan, who will soon be seen stepping in the shoes of  Amitabh Bachchan in upcoming film "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 Dinanath Chauhan, "Playing the role of Vijay Dinanath Chauhan was my toughest role to play till date. 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", says Hrithik.

"In case of "Agneepath" I feel it is the hardest film that I have done, especially the climax scene. I can’t talk much about it, you must go and watch 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 26th January 2012, stars Priyanka Chopra as the female lead, while Sanjay Dutt would play the villain's role, originally essayed by Danny Denzongpa.

"Priyanka is an amazing 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.