There is ONE way, ONLY one way and EXACTLY one way to make a decent Shadow of the Colossus movie and that's to not adapt the game itself. Seriously, the game is fucking amazing, but it's not filmable. What you need to do is make a prequel which covers all the juicy details the game didn't explain, such as who is Wander, who is Mono, how are they related to each other, how did Mono die, how did Wander come to steal the holy sword and escape into the forbidden land with Mono's body and who the hell are those guys who are chasing him? This story could actually be extremely gripping While the colossus fights would be unbelievably awesome to behold, once Wander reaches the forbidden land and begins hunting them down you've run out of plot. You'd have to end the movie no later than Wander meeting Dormin and being told how to revive Mono, then end with the message "If you want to know what happens next, go track down the game."