Chennai: Upcoming Telugu thriller "Anukshanam" is one of the most tiring films of actor Vishnu Manchu's career. He says the extremely tough character took a toll on him.

"This is probably one of the toughest characters I've played till now. It's also one of the most tiring films of my career. There are no breaks when you're working with RGV, and it's because he wants you to be in the character at all times. It left me mentally exhausted," Vishnu told IANS.