Actor and producer Vishal is on cloud nine following the success of his latest release, Pandiya Naadu! He says that his role in this movie was his most challenging, till date! He added that he took over a week just to unlearn whatever he had learnt in cinema till now, to prepare for the climax scene treating this as his first movie! Pandiya Naadu is doing great business at the theatres, and it being his maiden production venture, Vishal - the producer is sure to be happy too!