This is a really brilliant concept for a film. An intellectual exercise more than anything. I encourage you to watch it straight through once without knowing what is coming, but I also suspect it might turn out to be more entertaining when you know what is coming and can watch how it is built. If you want to maintain the surprise, you can read my No Spoilers review.
That was a very elaborate process! Getting to the theater from work, buying the ticket in advance so it wouldn’t be sold out, and on and on. But, worth it! Not as good as the best Ratnam film, but far better than the worst (Kadal).
This was the movie that I picked to download to my phone for my long day of travel, and I have no regrets! It was very very very pleasant. And a little interesting. But not super interesting.