World of Sea Battle

Open World· Massively Multiplayer· Pirates· Naval Combat

Early access since Oct 2025

World of Sea Battle is a free-to-play open-world MMO set in the Age of Sail. Catch the wind and fire a broadside before your enemy does. Rise from a schooner to a ship of the line through PvP and PvE battles, trade, explore the Endless Sea and join guild wars for the Archipelago.

75% positive · 9,070 reviews

Not yet

In early access, content still planned

High confidence

Content Planned

Not yet

In early access, content still planned

High confidence

Content Planned

Where to get it

Free on Steam

Steam Free

Evaluation

World of Sea Battle is an open-world naval MMO currently in Early Access on Steam, where it launched on October 21, 2025. Thera Interactive has been actively and consistently updating the game throughout its Early Access period. The developer published a full 2026 Development Plan on February 1, 2026, outlining four major named updates across the year. Update B19: New Horizon shipped on March 26, 2026, adding Points of Interest, a Wind Strength system, reworked faction wars, and ship class bonuses. Update B20: Naval Supremacy shipped on July 10, 2026, delivering guild progression overhauls, a new Specialist system, new ships, reputation changes, economy improvements, and more. These have been accompanied by a steady stream of hotfixes and patches, with the most recent developer communication on August 10, 2026. Two major updates from the roadmap remain ahead: Update B21: Through the Storm (planned for summer-autumn 2026), which promises significant expansion of the Endless Sea with new locations, resources, and gameplay mechanics, plus a new shipyard structure and ships; and Update B22 (planned for late 2026), which will rebalance port battles and city ownership systems. The May 27, 2026 Q&A explicitly reaffirmed that Endless Sea improvements and other long-term features remain part of the active development plan. The developer is actively building toward a 1.0 release with a clear pipeline of announced, undelivered content still to come.

Evidence

Update B20: Naval Supremacy shipped, delivering guild progression overhaul, new Specialist system, four new ships, reputation and economy reworks, and more.

news post · Jul 10, 2026 source content shipped

high

Developer Q&A confirmed that PvE events, guild cooperative activities, and major Endless Sea improvements are planned for the second half of 2026, reaffirming the roadmap.

news post · May 27, 2026 source content planned

high

Media

Details

Developer

Thera Interactive

Publisher

Thera Interactive

Achievements

Platform

Windows

Controller

—

Steam Deck

Playable

Players

Multiplayer · Co-op · PvP

Massively Multiplayer Open World Pirates Naval Combat Action Exploration Sailing Sandbox PvE 3D Third Person Atmospheric Alternate History Relaxing Team-Based

About this game

World of Sea Battle is a massive open-world MMO set in the Age of Sail, where every captain shares the same sea but charts their own course. Hunt pirates, cross swords with other players, explore distant shores, haul cargo and grow your fleet. The economy is in the players' hands, and guilds wage war for territory.

Weigh anchor in a humble schooner and rise to command a 100-gun first-rate ship of the line. Over 50 historical sailing ships from the 16th to 19th centuries await: schooners, galleons, brigantines and frigates. Upgrade your ships, refit their gear, change their look and build a fleet that suits the way you sail.

Set sail into the unknown. The whole Archipelago is one seamless sea, from the warm southern islands to the icy north. Merchants, pirates and other captains sail it alongside you, and any sail on the horizon could be prey or a threat. Past the edge of the map lies the Endless Sea, uncharted and full of danger.

Watch the wind, change course and pick your moment for a broadside. Round shot smashes hulls, bar shot tears sails and grapeshot cuts down crews. Enemy too heavily armored? Set it ablaze with heated shot. The right shot at the right moment can decide the battle. And if cannons aren't enough, close in on your enemy and board their ship.

Every captain chooses their own path to fortune. Haul goods between regions: tobacco and wine from the south, iron from the north. Turn raw materials into finished goods and sell them to other players on the exchange. Or load your hold with fishing gear and go looking for shoals: the catch feeds your crew, and what's left sells for a good price. Tired of honest work? Board merchant ships and sell the contents of their holds in port.

Amass enough gold and you can buy a private island of your own. It becomes your fleet's stronghold and a hub of commerce, with riches flowing in from distant mines and workshops.

Even the most seasoned captain needs a crew they can trust. Form a flotilla with friends to conquer the seas together and gain the upper hand on the waves. Ready for more? Join a guild, fight for ports, plot political intrigue and challenge for control of the Archipelago.

Last evaluated Aug 19, 2026