니오 is a popular action role-playing game developed by Team Ninja and published by Sony Interactive Entertainment. Set in a dark fantasy version of the Sengoku period in Japan, players control a character named William Adams, who battles various mythical creatures and historical figures. The game features challenging combat mechanics and a deep leveling system. The gameplay emphasizes skill and strategy, requiring players to learn enemy patterns and utilize different weapons and abilities. Players can explore diverse environments, collect loot, and engage in cooperative multiplayer modes. The series has received praise for its intricate design and engaging storylines.