Tchia isn't just a great open world adventure—one of the best I've played in ages—but it also has a fantastic treasure map side quest. The world of Tchia is filled with hidden treasure chests, and the only way to find them is by following a series of 21 hand-drawn treasure maps showing different landmarks, locations, and clues around the islands...
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Tchia treasure map guide: How to find and open every hidden chest
Source: PC Gamer (opens in a new tab)