The Game Census
Uncharted Waters Online cover art

Uncharted Waters Online

KOEI TECMO GAMES CO., LTD. · Papaya Play · 2018-12-19

Steam

AdventureMassively MultiplayerRPGStrategyFree To Play

Modes: Multiplayer, Co-operative, Massively Multiplayer Online (MMO)

Releases: Mar 03, 2005 (PC (Microsoft Windows)), 2009 (PlayStation 3), 2015 (PlayStation 4)

Discover yourself in the “Age of Discovery” where you’ll sail out into the uncharted waters! Discover real historical artifacts and mystical legends! Start a company and make enormous fortunes! Fight in fierce sea battles! Whatever your play style, you can play who you want and how you want in UWO!

10
playing now
69%
positive of 430 reviews
Mixed
steam rating
100,000–200,000
owners (SteamSpy est.)
gold
deck/linux tier (ProtonDB)
Free
steam price (US)

10 players in-game as of 2026-08-30 06:00 UTC (census sample)

Uncharted Waters Online is an MMORPG set in the Age of Exploration, with the English version published by Papaya Play. It features over a hundred different sailing ships and an open world based on real Earth geography, with players engage in many activities such as combat, exploration, and trade on both sea and land while interacting with each other. It has a sandbox style game play and skill based character development. The game requires monthly subscription fee in Japan but the international server is free to play. It is developed by KOEI based on the Uncharted Waters series of games, and originally released in Japan.

Health check

Quiet
  • · 10 players in-game at the last census sample.
  • · 17 reviews in the last 8 weeks (~2/week).
  • · Review velocity down 37% vs the prior 8 weeks.
  • · Current weekly pace is under 5% of the all-time peak week (58 reviews).
  • · Top 43% of 11,312 Adventure games in the census by review count.

Review momentum

PositiveNegative
414120182026Week of 2018-12-01: 41 positiveWeek of 2018-12-01: 17 negativeWeek of 2019-01-01: 16 positiveWeek of 2019-01-01: 14 negativeWeek of 2019-02-01: 7 positiveWeek of 2019-02-01: 6 negativeWeek of 2019-03-01: 3 positiveWeek of 2019-03-01: 1 negativeWeek of 2019-04-01: 4 positiveWeek of 2019-04-01: 1 negativeWeek of 2019-05-01: 2 positiveWeek of 2019-05-01: 2 negativeWeek of 2019-06-01: 6 positiveWeek of 2019-06-01: 2 negativeWeek of 2019-07-01: 3 positiveWeek of 2019-08-01: 4 positiveWeek of 2019-08-01: 1 negativeWeek of 2019-09-01: 1 positiveWeek of 2019-09-01: 1 negativeWeek of 2019-10-01: 5 positiveWeek of 2019-10-01: 1 negativeWeek of 2019-11-01: 13 positiveWeek of 2019-11-01: 1 negativeWeek of 2019-12-01: 7 positiveWeek of 2019-12-01: 2 negativeWeek of 2020-01-01: 5 positiveWeek of 2020-01-01: 2 negativeWeek of 2020-02-01: 1 positiveWeek of 2020-03-01: 7 positiveWeek of 2020-04-01: 6 positiveWeek of 2020-04-01: 2 negativeWeek of 2020-05-01: 6 positiveWeek of 2020-05-01: 4 negativeWeek of 2020-06-01: 4 positiveWeek of 2020-06-01: 2 negativeWeek of 2020-07-01: 2 positiveWeek of 2020-07-01: 3 negativeWeek of 2020-08-01: 6 positiveWeek of 2020-08-01: 1 negativeWeek of 2020-09-01: 4 positiveWeek of 2020-09-01: 2 negativeWeek of 2020-10-01: 3 positiveWeek of 2020-10-01: 1 negativeWeek of 2020-11-01: 5 positiveWeek of 2020-12-01: 5 positiveWeek of 2020-12-01: 2 negativeWeek of 2021-01-01: 7 positiveWeek of 2021-01-01: 2 negativeWeek of 2021-02-01: 2 positiveWeek of 2021-02-01: 1 negativeWeek of 2021-03-01: 5 positiveWeek of 2021-03-01: 2 negativeWeek of 2021-04-01: 4 positiveWeek of 2021-05-01: 4 positiveWeek of 2021-05-01: 2 negativeWeek of 2021-06-01: 2 positiveWeek of 2021-07-01: 2 negativeWeek of 2021-08-01: 8 positiveWeek of 2021-09-01: 4 positiveWeek of 2021-09-01: 1 negativeWeek of 2021-10-01: 3 positiveWeek of 2021-10-01: 2 negativeWeek of 2021-11-01: 2 positiveWeek of 2021-11-01: 1 negativeWeek of 2021-12-01: 6 positiveWeek of 2022-01-01: 2 positiveWeek of 2022-01-01: 2 negativeWeek of 2022-02-01: 2 positiveWeek of 2022-02-01: 1 negativeWeek of 2022-03-01: 2 positiveWeek of 2022-03-01: 2 negativeWeek of 2022-04-01: 2 positiveWeek of 2022-05-01: 1 positiveWeek of 2022-05-01: 1 negativeWeek of 2022-06-01: 2 positiveWeek of 2022-07-01: 2 positiveWeek of 2022-07-01: 3 negativeWeek of 2022-08-01: 2 positiveWeek of 2022-08-01: 1 negativeWeek of 2022-09-01: 4 positiveWeek of 2022-10-01: 4 positiveWeek of 2022-10-01: 1 negativeWeek of 2022-11-01: 3 positiveWeek of 2022-11-01: 1 negativeWeek of 2022-12-01: 2 positiveWeek of 2023-01-01: 1 positiveWeek of 2023-01-01: 4 negativeWeek of 2023-02-01: 4 positiveWeek of 2023-02-01: 3 negativeWeek of 2023-03-01: 1 negativeWeek of 2023-04-01: 1 positiveWeek of 2023-05-01: 3 positiveWeek of 2023-06-01: 3 positiveWeek of 2023-06-01: 1 negativeWeek of 2023-07-01: 1 positiveWeek of 2023-07-01: 2 negativeWeek of 2023-08-01: 2 positiveWeek of 2023-08-01: 1 negativeWeek of 2023-09-01: 2 positiveWeek of 2023-10-01: 4 positiveWeek of 2023-10-01: 3 negativeWeek of 2023-11-01: 1 positiveWeek of 2023-11-01: 1 negativeWeek of 2023-12-01: 2 positiveWeek of 2023-12-01: 1 negativeWeek of 2024-01-01: 1 positiveWeek of 2024-01-01: 2 negativeWeek of 2024-02-01: 1 positiveWeek of 2024-02-01: 1 negativeWeek of 2024-03-01: 2 positiveWeek of 2024-05-01: 2 positiveWeek of 2024-05-01: 4 negativeWeek of 2024-06-01: 1 negativeWeek of 2024-07-01: 1 positiveWeek of 2024-07-01: 3 negativeWeek of 2024-08-01: 5 positiveWeek of 2024-08-01: 1 negativeWeek of 2024-09-01: 2 positiveWeek of 2024-10-01: 1 negativeWeek of 2024-11-01: 3 positiveWeek of 2024-12-01: 2 positiveWeek of 2024-12-01: 2 negativeWeek of 2025-01-01: 2 positiveWeek of 2025-01-01: 4 negativeWeek of 2025-02-01: 2 positiveWeek of 2025-02-01: 1 negativeWeek of 2025-04-01: 4 positiveWeek of 2025-05-01: 1 positiveWeek of 2025-05-01: 1 negativeWeek of 2025-06-01: 1 positiveWeek of 2025-07-01: 2 positiveWeek of 2025-07-01: 2 negativeWeek of 2025-08-01: 5 positiveWeek of 2025-08-01: 1 negativeWeek of 2025-09-01: 1 negativeWeek of 2025-10-01: 1 positiveWeek of 2025-11-01: 2 positiveWeek of 2025-11-01: 1 negativeWeek of 2025-12-01: 2 positiveWeek of 2025-12-01: 1 negativeWeek of 2026-01-01: 1 positiveWeek of 2026-01-01: 1 negativeWeek of 2026-03-01: 1 positiveWeek of 2026-04-01: 2 negativeWeek of 2026-05-01: 1 positiveWeek of 2026-05-01: 2 negativeWeek of 2026-06-01: 1 positiveWeek of 2026-06-01: 1 negativeWeek of 2026-07-01: 2 negative
Weekly review counts (Steam review histogram). Positive above the line, negative below.

Players online

32102026-08-11 18:00 — 24 players2026-08-12 10:00 — 21 players2026-08-13 02:00 — 22 players2026-08-13 18:00 — 27 players2026-08-14 09:00 — 16 players2026-08-15 01:00 — 23 players2026-08-15 17:00 — 25 players2026-08-16 09:00 — 20 players2026-08-17 01:00 — 18 players2026-08-17 17:00 — 23 players2026-08-18 09:00 — 13 players2026-08-19 00:00 — 20 players2026-08-19 16:00 — 18 players2026-08-20 08:00 — 10 players2026-08-20 22:00 — 23 players2026-08-21 14:00 — 22 players2026-08-22 06:00 — 19 players2026-08-22 22:00 — 17 players2026-08-23 13:00 — 31 players2026-08-24 05:00 — 15 players2026-08-24 21:00 — 28 players2026-08-25 13:00 — 32 players2026-08-26 05:00 — 15 players2026-08-26 22:00 — 26 players2026-08-27 14:00 — 18 players2026-08-28 06:00 — 15 players2026-08-28 22:00 — 20 players2026-08-29 14:00 — 14 players2026-08-30 06:00 — 10 players
Concurrent players, hourly average, last 30 days (census samples).

Details

WindowsMulti-playerMMOPvPOnline PvPCo-opOnline Co-opIn-App PurchasesFamily Sharing

Player tags

RPGAnimeNavalMMORPGPiratesSailingTradingStrategyAdventureOpen World

Census log

Computed from census-recorded observations only — dates are observation dates.

Recent updates

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