"My role in 'Revolver Rani' is very difficult to portray. I think 'Revolver Rani' is my toughest role so far," Kangna told IANS.
"It's a very unusual film, in which my looks are very different. I have to look unattractive in the film and for the first time I have to take care that I do not look beautiful," added the actress who apparently took training to use the revolver to make her role believable.
Reportedly, Tabu was approached for the role before Kangna.
Directed by Sai Kabir, the film is being co-produced by Tigmanshu Dhulia and Rahul Mittra.
The actress, who was seen in "Shootout at Wadala", is happy with the kind of films she is doing.
She said: "It's going to be an exciting year for me. I am doing some different roles in each film. I am extremely happy with the kind of scripts I am getting these days."
Her next will be "Krrish 3".