As you make your way towards the Lighthouse, you'll encounter a series of interconnected light anomalies that weave together the final pieces of the puzzle. These memories will often feature multiple characters, showing their final moments and their collective understanding (or lack thereof) of the 'Pattern'.
The environment itself will become more atmospheric, with subtle changes in lighting and sound design. Pay close attention to the dialogue in these final sequences, as they contain the most direct explanations and emotional resolutions. The path is linear, so simply follow the glowing anomalies and the narrative flow.