The England goalkeeper, who won the Performance of the Season in 2010/11 after a stunning solo display against Tottenham, at least equalled his White Hart Lane heroics against Borussia Dortmund with as many as half-a-dozen top drawer saves.
"They were getting chances when it was three at the back, four at the back, ten at the back," Hart told City's website.
"We've got to be happy with a point. It could have been 10-10, their keeper was fantastic and both sides had a lot of chances.
"Can I recall a night when I was that busy? Not off the top of my head! Dortmund were different class tonight. I hope it wasn't a wasted effort, I think this shows what a tough group we're in.
"But Mario's never going to miss the penalty. We pushed hard, we needed a point, we've come out intact and the group is still alive for us."