Last year I read Anthony Shaffer's play about these two men in a battle of wits to see which one can get the most twisted revenge on the other. I then saw the 2007 remake and, finally, watched this better 1972 adaptation. Michael Caine is much better as young actor Milo than old author Andrew. Both Laurence Olivier and Michael Caine are in top form. The camera work by Oswald Morris and production design by Ken Adam show that they were masters of their craft. Anthony Shaffer is given screenplay credit. The strength of the stage play shines through without trying to change it up for the screen. Director Joseph L. Mankiewicz, who has a long filmmography as a writer, trusts the material for its game aspect and dramatics. The twists and turns are incredibly cunning and kept my attention for the over two hour run time. It just keeps pushing the suspense further and further.