Daikoukai Jidai IV - Rota Nova (大航海時代IV - ROTA NOVA, Japanese) is a turn-based strategy game developed and published by Koei. It is the fourth title of the popular Daikoukai Jidai series, and the first to be released on the Nintendo DS. The game is set in the Age of Exploration and the player takes on the role of a leader of a trading company. The goal is to build a trading empire by establishing a network of trade routes and expanding their influence. The game features an extensive trading system and a variety of strategic options. Players must manage their resources, build fleets, and make diplomatic decisions in order to succeed. The game also features an extensive quest system, allowing players to explore the world and uncover secrets. Daikoukai Jidai IV - Rota Nova is a deep and engaging experience for fans of the series and those new to the genre.