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) · Perspectives: Third person

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!

Uncharted Waters Online is an Adventure, Massively Multiplayer, RPG, Strategy game released in 2018, estimated to have 100,000 .. 200,000 owners, free-to-play, with a Mixed review sentiment (69% of 431 reviews).

17
playing now
69%
positive of 431 reviews
Mixed
steam's rating (official)
100,000–200,000
owners (SteamSpy est.)
gold
deck/linux tier (ProtonDB)
Unknown
Steam Deck (Valve)
SteamOS: 0
Free
steam price (US)

17 players in-game as of 2026-10-14 16:00 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
  • · 17 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 21% of 28,838 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

35122026-09-15 01:00 — 21 players2026-09-16 09:00 — 15 players2026-09-17 17:00 — 27 players2026-09-19 00:00 — 24 players2026-09-20 08:00 — 17 players2026-09-21 15:00 — 21 players2026-09-22 23:00 — 24 players2026-09-24 06:00 — 16 players2026-09-25 14:00 — 24 players2026-09-26 21:00 — 28 players2026-09-28 05:00 — 16 players2026-09-29 12:00 — 21 players2026-09-30 20:00 — 27 players2026-10-02 03:00 — 16 players2026-10-03 11:00 — 18 players2026-10-04 19:00 — 22 players2026-10-06 03:00 — 20 players2026-10-07 10:00 — 16 players2026-10-08 18:00 — 25 players2026-10-10 01:00 — 24 players2026-10-11 09:00 — 19 players2026-10-12 16:00 — 25 players2026-10-14 00:00 — 18 players2026-10-14 16:00 — 17 players
Concurrent players, hourly average, last 30 days (census samples).
12021Dec 2018Aug 2026Dec 2018 — avg 120 · peak 175Mar 2019 — avg 48 · peak 77Jun 2019 — avg 42 · peak 64Sep 2019 — avg 29 · peak 56Dec 2019 — avg 30 · peak 46Mar 2020 — avg 41 · peak 70Jun 2020 — avg 47 · peak 72Sep 2020 — avg 35 · peak 60Dec 2020 — avg 39 · peak 74Mar 2021 — avg 46 · peak 75Jun 2021 — avg 44 · peak 77Sep 2021 — avg 33 · peak 48Dec 2021 — avg 29 · peak 51Mar 2022 — avg 30 · peak 53Jun 2022 — avg 32 · peak 52Sep 2022 — avg 30 · peak 50Dec 2022 — avg 30 · peak 46Mar 2023 — avg 40 · peak 67Jun 2023 — avg 28 · peak 45Sep 2023 — avg 25 · peak 46Dec 2023 — avg 23 · peak 45Mar 2024 — avg 24 · peak 40Jun 2024 — avg 21 · peak 33Sep 2024 — avg 31 · peak 47Dec 2024 — avg 30 · peak 47Mar 2025 — avg 26 · peak 42Jun 2025 — avg 23 · peak 37Sep 2025 — avg 22 · peak 42Dec 2025 — avg 24 · peak 41Mar 2026 — avg 41 · peak 65Jun 2026 — avg 25 · peak 40Aug 2026 — avg 22 · peak 39
Monthly average players (source: steamcharts.com) — history via steamcharts.com; live census sampling since Aug 2026.

Attention

2632026-06-02 — 25 pageviews2026-06-06 — 16 pageviews2026-06-10 — 12 pageviews2026-06-14 — 16 pageviews2026-06-18 — 10 pageviews2026-06-22 — 20 pageviews2026-06-26 — 16 pageviews2026-06-30 — 21 pageviews2026-07-04 — 20 pageviews2026-07-08 — 14 pageviews2026-07-12 — 13 pageviews2026-07-16 — 21 pageviews2026-07-20 — 16 pageviews2026-07-24 — 17 pageviews2026-07-28 — 19 pageviews2026-08-01 — 11 pageviews2026-08-05 — 9 pageviews2026-08-09 — 18 pageviews2026-08-13 — 7 pageviews2026-08-17 — 13 pageviews2026-08-21 — 9 pageviews2026-08-25 — 12 pageviews2026-08-29 — 12 pageviews2026-09-02 — 17 pageviews2026-09-06 — 16 pageviews2026-09-10 — 19 pageviews2026-09-14 — 19 pageviews2026-09-18 — 18 pageviews2026-09-22 — 15 pageviews2026-09-26 — 10 pageviews2026-09-30 — 18 pageviews2026-10-04 — 3 pageviews2026-10-08 — 17 pageviews2026-10-11 — 12 pageviews
Daily Wikipedia pageviews (attention proxy, census-recorded).

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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Similarity via IGDB.

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