Inception
Perfect film. A tight script. The pace is perfect. The plot twists are perfect. The acting is perfect. I can't find any flaws in this. I don't even think this movie is that hard to understand tbh. Only the last scene is debatable, and that too depends on your interpretation. Rest of the movie is pretty straight forward (Memento and tenet are 100 times more confusing). But yeah regardless this is top 3-4 nolan. Kept me HOOKED the whole time.
Also having Cillian Murphy is a cheat code tbh