Play Daikoukai Jidai IV - Rota Nova (J) Online

Daikoukai Jidai IV: Rota Nova came out for the Nintendo DS in 2005, developed and published by Koei. It was part of that early wave of DS games that really tried to use both screens in interesting ways, fitting right in with an era where developers were still figuring out what the hardware could do.

You control a ship captain, managing a fleet while exploring a large world map divided into smaller grids. The main goal is to build trade routes, discover new ports, and establish your reputation across the oceans. Key mechanics include real time naval combat where wind direction affects your movement and aiming, and managing your crew's morale and supplies during long voyages. The pacing is deliberate, sometimes slow, with a difficulty that spikes when you run into hostile ships or bad weather. It feels like a thoughtful, hands on simulation of life at sea during the age of exploration.