The Game Census
Ys IX: Monstrum Nox cover art

Ys IX: Monstrum Nox

Nihon Falcom · NIS America, Inc. · 2021-07-06

SteamGOGPlayStation StoreEpic Games StoreAmazon

ActionRPG

Franchise: Ys · Modes: Single player, Multiplayer, Co-operative · Perspectives: Third person

Releases: Jul 06, 2021 (Google Stadia), Sep 09, 2021 (Nintendo Switch), Sep 26, 2019 (PlayStation 4), May 12, 2023 (PlayStation 5), Jul 06, 2021 (PC (Microsoft Windows))

While imprisoned in Balduq, Adol is cursed and becomes a Monstrum. With his newfound powers, he must stop the Grimwald Nox from consuming the city.

14
playing now
94%
positive of 1.9k reviews
Very Positive
steam's rating (official)
50,000–100,000
owners (SteamSpy est.)
84/100
critic score (6 outlets, IGDB)
83/100
IGDB user rating (34 ratings)
20
Nexus mods (11k downloads)
4.67★
PlayStation Store rating (4,390 ratings)
53h
to beat · rushed 30h · completionist 50h
platinum
deck/linux tier (ProtonDB)
Verified
Steam Deck (Valve)
SteamOS: Playable
$59.99
steam price (US)

14 players in-game as of 2026-10-14 17:00 UTC (census sample)

Ys IX: Monstrum Nox is a 2019 action role-playing game developed by Nihon Falcom. The ninth numbered installment in the Ys series, it was first released for the PlayStation 4 in Japan in September 2019. NIS America released the game internationally in February 2021, followed by versions for Windows, Nintendo Switch, Google Stadia, and PlayStation 5.

Health check

Quietly active
  • · 14 players in-game at the last census sample.
  • · 114 reviews in the last 8 weeks (~14/week).
  • · Review velocity up 10% vs the prior 8 weeks.
  • · Current weekly pace is under 5% of the all-time peak week (460 reviews).
  • · Top 11% of 27,808 Action games in the census by review count.

Health tier since 2026-08-31

Estimated sales: 39k–87k copies

Review-multiple estimate from 1,937 total reviews — how this is computed.

All-time low: $23.99 at Steam (2025-10-31)via IsThereAnyDeal

12-month high $59.99 · on sale 12 of 26 observed days (census price snapshots)

Review momentum

PositiveNegative
44044020212026Week of 2021-07-01: 440 positiveWeek of 2021-07-01: 20 negativeWeek of 2021-08-01: 138 positiveWeek of 2021-08-01: 7 negativeWeek of 2021-09-01: 67 positiveWeek of 2021-09-01: 3 negativeWeek of 2021-10-01: 61 positiveWeek of 2021-10-01: 2 negativeWeek of 2021-11-01: 90 positiveWeek of 2021-11-01: 2 negativeWeek of 2021-12-01: 41 positiveWeek of 2021-12-01: 6 negativeWeek of 2022-01-01: 57 positiveWeek of 2022-01-01: 4 negativeWeek of 2022-02-01: 39 positiveWeek of 2022-02-01: 3 negativeWeek of 2022-03-01: 15 positiveWeek of 2022-03-01: 5 negativeWeek of 2022-04-01: 24 positiveWeek of 2022-04-01: 6 negativeWeek of 2022-05-01: 19 positiveWeek of 2022-05-01: 2 negativeWeek of 2022-06-01: 17 positiveWeek of 2022-07-01: 26 positiveWeek of 2022-07-01: 1 negativeWeek of 2022-08-01: 14 positiveWeek of 2022-09-01: 17 positiveWeek of 2022-09-01: 2 negativeWeek of 2022-10-01: 17 positiveWeek of 2022-10-01: 3 negativeWeek of 2022-11-01: 25 positiveWeek of 2022-11-01: 2 negativeWeek of 2022-12-01: 18 positiveWeek of 2023-01-01: 21 positiveWeek of 2023-01-01: 1 negativeWeek of 2023-02-01: 9 positiveWeek of 2023-02-01: 1 negativeWeek of 2023-03-01: 11 positiveWeek of 2023-03-01: 2 negativeWeek of 2023-04-01: 9 positiveWeek of 2023-04-01: 2 negativeWeek of 2023-05-01: 13 positiveWeek of 2023-06-01: 13 positiveWeek of 2023-07-01: 11 positiveWeek of 2023-07-01: 1 negativeWeek of 2023-08-01: 5 positiveWeek of 2023-09-01: 6 positiveWeek of 2023-09-01: 1 negativeWeek of 2023-10-01: 28 positiveWeek of 2023-10-01: 3 negativeWeek of 2023-11-01: 18 positiveWeek of 2023-11-01: 1 negativeWeek of 2023-12-01: 13 positiveWeek of 2024-01-01: 20 positiveWeek of 2024-01-01: 1 negativeWeek of 2024-02-01: 14 positiveWeek of 2024-02-01: 1 negativeWeek of 2024-03-01: 16 positiveWeek of 2024-03-01: 4 negativeWeek of 2024-04-01: 11 positiveWeek of 2024-05-01: 14 positiveWeek of 2024-05-01: 1 negativeWeek of 2024-06-01: 9 positiveWeek of 2024-06-01: 1 negativeWeek of 2024-07-01: 13 positiveWeek of 2024-07-01: 3 negativeWeek of 2024-08-01: 18 positiveWeek of 2024-08-01: 1 negativeWeek of 2024-09-01: 14 positiveWeek of 2024-10-01: 14 positiveWeek of 2024-10-01: 2 negativeWeek of 2024-11-01: 28 positiveWeek of 2024-11-01: 2 negativeWeek of 2024-12-01: 17 positiveWeek of 2024-12-01: 1 negativeWeek of 2025-01-01: 12 positiveWeek of 2025-01-01: 2 negativeWeek of 2025-02-01: 13 positiveWeek of 2025-03-01: 11 positiveWeek of 2025-03-01: 1 negativeWeek of 2025-04-01: 9 positiveWeek of 2025-04-01: 1 negativeWeek of 2025-05-01: 8 positiveWeek of 2025-06-01: 9 positiveWeek of 2025-07-01: 13 positiveWeek of 2025-07-01: 2 negativeWeek of 2025-08-01: 12 positiveWeek of 2025-09-01: 11 positiveWeek of 2025-10-01: 15 positiveWeek of 2025-10-01: 1 negativeWeek of 2025-11-01: 22 positiveWeek of 2025-11-01: 1 negativeWeek of 2025-12-01: 16 positiveWeek of 2025-12-01: 1 negativeWeek of 2026-01-01: 19 positiveWeek of 2026-01-01: 1 negativeWeek of 2026-02-01: 9 positiveWeek of 2026-03-01: 9 positiveWeek of 2026-03-01: 1 negativeWeek of 2026-04-01: 5 positiveWeek of 2026-05-01: 22 positiveWeek of 2026-05-01: 3 negativeWeek of 2026-06-01: 10 positiveWeek of 2026-06-01: 3 negativeWeek of 2026-07-01: 14 positiveWeek of 2026-07-01: 1 negativeWeek of 2026-08-01: 12 positiveWeek of 2026-08-01: 1 negative
Weekly review counts (Steam review histogram). Positive above the line, negative below.

Players online

2442026-09-15 18:00 — 12 players2026-09-17 02:00 — 12 players2026-09-18 10:00 — 9 players2026-09-19 17:00 — 24 players2026-09-21 01:00 — 23 players2026-09-22 08:00 — 7 players2026-09-23 16:00 — 14 players2026-09-24 23:00 — 11 players2026-09-26 07:00 — 19 players2026-09-27 14:00 — 16 players2026-09-28 22:00 — 7 players2026-09-30 05:00 — 4 players2026-10-01 13:00 — 4 players2026-10-02 20:00 — 10 players2026-10-04 04:00 — 16 players2026-10-05 12:00 — 9 players2026-10-06 20:00 — 4 players2026-10-08 03:00 — 8 players2026-10-09 11:00 — 5 players2026-10-10 18:00 — 10 players2026-10-12 02:00 — 16 players2026-10-13 09:00 — 5 players2026-10-14 17:00 — 14 players
Concurrent players, hourly average, last 30 days (census samples).
51117Jul 2021Aug 2026Jul 2021 — avg 511 · peak 1,352Sep 2021 — avg 75 · peak 188Nov 2021 — avg 53 · peak 117Jan 2022 — avg 82 · peak 163Mar 2022 — avg 35 · peak 93May 2022 — avg 43 · peak 90Jul 2022 — avg 41 · peak 79Sep 2022 — avg 36 · peak 92Nov 2022 — avg 39 · peak 81Jan 2023 — avg 44 · peak 104Mar 2023 — avg 24 · peak 63May 2023 — avg 29 · peak 63Jul 2023 — avg 29 · peak 77Sep 2023 — avg 17 · peak 36Nov 2023 — avg 28 · peak 69Jan 2024 — avg 34 · peak 79Mar 2024 — avg 28 · peak 62May 2024 — avg 31 · peak 87Jul 2024 — avg 30 · peak 64Sep 2024 — avg 24 · peak 49Nov 2024 — avg 61 · peak 127Jan 2025 — avg 38 · peak 94Mar 2025 — avg 25 · peak 55May 2025 — avg 27 · peak 55Jul 2025 — avg 28 · peak 67Sep 2025 — avg 17 · peak 40Nov 2025 — avg 35 · peak 79Jan 2026 — avg 30 · peak 76Mar 2026 — avg 19 · peak 47May 2026 — avg 29 · peak 70Jul 2026 — avg 27 · peak 73Aug 2026 — avg 21 · peak 45
Monthly average players (source: steamcharts.com) — history via steamcharts.com; live census sampling since Aug 2026.

Price history

$94.27$23.992021-07-062026-07-092021-07-06 — best price $59.992021-11-19 — best price $47.992021-12-01 — best price $59.992022-01-06 — best price $59.992022-02-03 — best price $59.992022-03-21 — best price $59.992022-05-07 — best price $59.992022-06-24 — best price $47.992022-07-25 — best price $59.992022-09-12 — best price $59.992022-11-01 — best price $41.992022-12-02 — best price $59.992023-01-06 — best price $59.992023-03-23 — best price $41.992023-05-12 — best price $59.992023-07-18 — best price $59.992023-08-25 — best price $59.992023-11-01 — best price $35.992023-12-11 — best price $35.992024-01-10 — best price $94.272024-03-20 — best price $35.992024-05-01 — best price $35.992024-06-27 — best price $35.992024-08-05 — best price $35.992024-10-25 — best price $29.992024-12-03 — best price $59.992025-01-05 — best price $59.992025-02-17 — best price $59.992025-03-31 — best price $59.992025-05-19 — best price $29.992025-07-25 — best price $30.002025-09-04 — best price $59.992025-11-05 — best price $29.992025-12-03 — best price $59.992025-12-22 — best price $23.992026-07-09 — best price $59.99
Lowest recorded price across tracked stores, per day (census snapshots).

Attention

126412026-05-30 — 73 pageviews2026-06-03 — 68 pageviews2026-06-07 — 92 pageviews2026-06-11 — 72 pageviews2026-06-15 — 93 pageviews2026-06-19 — 77 pageviews2026-06-23 — 59 pageviews2026-06-27 — 75 pageviews2026-07-01 — 70 pageviews2026-07-05 — 110 pageviews2026-07-09 — 90 pageviews2026-07-13 — 74 pageviews2026-07-17 — 111 pageviews2026-07-21 — 91 pageviews2026-07-25 — 82 pageviews2026-07-29 — 65 pageviews2026-08-02 — 77 pageviews2026-08-06 — 73 pageviews2026-08-10 — 69 pageviews2026-08-14 — 82 pageviews2026-08-18 — 81 pageviews2026-08-22 — 61 pageviews2026-08-26 — 126 pageviews2026-08-30 — 99 pageviews2026-09-03 — 88 pageviews2026-09-07 — 99 pageviews2026-09-11 — 93 pageviews2026-09-15 — 113 pageviews2026-09-19 — 76 pageviews2026-09-23 — 92 pageviews2026-09-27 — 75 pageviews2026-10-01 — 41 pageviews2026-10-05 — 63 pageviews2026-10-09 — 54 pageviews
Daily Wikipedia pageviews (attention proxy, census-recorded).

Completion

54
achievements tracked
92.1%
earned "To Freedom"
34%
median achievement earned by

Global achievement rates from Steam.

Details

WindowsFull controller supportSingle-playerMulti-playerCo-opShared/Split Screen Co-opShared/Split ScreenSteam AchievementsFull controller supportSteam Trading CardsColor AlternativesCustom Volume Controls4 DLC

2 supported languages: English, French

Post-launch support: 4 DLC released, first 2021-07-06 (Steam store data)

Console footprint

PlatformPlayers trackedCompletionTrophies/achievements
PS4 (PlayStation)7,86720%54
Steam (Steam)1,93614%54
PS5 (PlayStation)49328%54
Steam (Steam)23617%54
Switch (Nintendo)1330%0

Players tracked by Exophase (achievement/trophy trackers) — a sample of the player base, not total sales.

Player tags

3DRPGDarkJRPGAnimeDramaActionFantasyColorfulAdventure

Census log

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

Players also track

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Similarity via IGDB.

Official site ↗Wikipedia ↗