The "Puzzle Cubes" are the keys to the tomb. Players must defeat the shrines in Omu to get them. The Tomb of Annihilation PDF details the puzzles in each shrine. Some require combat, others require clever thinking. The digital guide provides the solutions and the maps for these mini-dungeons. DMs use the PDF to track which cubes the party has collected and which are held by rivals. It creates a dynamic scavenger hunt in the ruined city. The PDF is the checklist the DM needs to manage this complex chapter.