He says despite the "mixed" response that the Shah Rukh Khan starrer received, for him it's a project that he looks back at with pride.

"Some called it a damp firecracker and some called it a game changer. I know it should have made more but it still made enough that 95 percent of the films don't make even today. I gave it four years of my life and I look back at the mixed feeling with a lot of pride and satisfaction," Sinha tweeted on Monday.

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The science fiction superhero film featured Shah Rukh in a double role apart from Kareena Kapoor Khan and Arjun Rampal.

Sinha also thanked the audience and critics for lauding and rejecting the film.

"Thanks for the accolades and the rejection. I learned from both. Yes, today it has been four years since 'Ra.One' released and I send my love and respect to the team and the audience, the lovers and the critics. Thank you all. It left me richer," he added.

The 2011 film also features Armaan Verma, Shahana Goswami and Tom Wu in pivotal roles. It was high on visual effects.