The Game Census
Zen of Sudoku cover art

Zen of Sudoku

Unknown Worlds Entertainment · 2006-12-14

Steam

CasualIndie

Modes: Single player

Releases: Dec 14, 2006 (PC (Microsoft Windows))

From the creators of Natural Selection comes Zen of Sudoku, a relaxing, easy to play version of Sudoku for your PC.Relax with hand-painted Japanese-styled backgrounds, no timer and lush natural soundscapes.Stimulates your brain to keep it healthy and alert.

Zen of Sudoku is a 2006 Casual and Indie game that is free-to-play, with an owner estimate of 20,000 .. 50,000 and a Very Positive review sentiment (89% of 377 reviews).

7
playing now
89%
positive of 377 reviews
Very Positive
steam's rating (official)
20,000–50,000
owners (SteamSpy est.)
80/100
IGDB user rating (2 ratings)
platinum
deck/linux tier (ProtonDB)
Playable
Steam Deck (Valve)
SteamOS: Playable
Free
steam price (US)

7 players in-game as of 2026-10-14 06:00 UTC (census sample)

Unknown Worlds Entertainment, Inc. is an American video game developer based in San Francisco. The studio is best known for the Natural Selection and Subnautica series. In October 2021, the studio was acquired by South Korean video game developer Krafton.

Health check

Quietly active
  • · 7 players in-game at the last census sample.
  • · 28 reviews in the last 8 weeks (~4/week).
  • · Review velocity up 40% vs the prior 8 weeks.
  • · Top 15% of 29,032 Casual games in the census by review count.

Health tier since 2026-09-01

All-time low: $1.24 at Steam (2013-11-27)via IsThereAnyDeal

Review momentum

PositiveNegative
9920162026Week of 2016-10-01: 1 positiveWeek of 2016-11-01: 3 positiveWeek of 2017-02-01: 1 positiveWeek of 2017-05-01: 1 positiveWeek of 2017-07-01: 1 positiveWeek of 2017-09-01: 2 positiveWeek of 2017-09-01: 2 negativeWeek of 2017-12-01: 6 positiveWeek of 2017-12-01: 2 negativeWeek of 2018-01-01: 2 positiveWeek of 2018-01-01: 1 negativeWeek of 2018-02-01: 3 positiveWeek of 2018-02-01: 1 negativeWeek of 2018-03-01: 1 positiveWeek of 2018-04-01: 3 positiveWeek of 2018-05-01: 2 positiveWeek of 2018-05-01: 1 negativeWeek of 2018-06-01: 5 positiveWeek of 2018-08-01: 2 positiveWeek of 2018-09-01: 2 positiveWeek of 2018-09-01: 1 negativeWeek of 2018-10-01: 3 positiveWeek of 2018-11-01: 1 positiveWeek of 2018-12-01: 3 positiveWeek of 2019-01-01: 4 positiveWeek of 2019-02-01: 4 positiveWeek of 2019-03-01: 1 positiveWeek of 2019-04-01: 2 positiveWeek of 2019-04-01: 1 negativeWeek of 2019-05-01: 1 positiveWeek of 2019-05-01: 1 negativeWeek of 2019-06-01: 4 positiveWeek of 2019-06-01: 1 negativeWeek of 2019-07-01: 6 positiveWeek of 2019-08-01: 1 positiveWeek of 2019-10-01: 1 positiveWeek of 2019-11-01: 2 positiveWeek of 2019-12-01: 5 positiveWeek of 2020-01-01: 5 positiveWeek of 2020-02-01: 5 positiveWeek of 2020-03-01: 2 positiveWeek of 2020-04-01: 4 positiveWeek of 2020-04-01: 3 negativeWeek of 2020-05-01: 5 positiveWeek of 2020-06-01: 1 positiveWeek of 2020-07-01: 6 positiveWeek of 2020-08-01: 3 positiveWeek of 2020-08-01: 1 negativeWeek of 2020-09-01: 1 positiveWeek of 2020-10-01: 1 positiveWeek of 2020-10-01: 1 negativeWeek of 2020-12-01: 2 positiveWeek of 2021-01-01: 3 positiveWeek of 2021-02-01: 3 positiveWeek of 2021-03-01: 3 positiveWeek of 2021-05-01: 2 positiveWeek of 2021-06-01: 5 positiveWeek of 2021-07-01: 4 positiveWeek of 2021-08-01: 6 positiveWeek of 2021-09-01: 4 positiveWeek of 2021-11-01: 2 positiveWeek of 2021-11-01: 1 negativeWeek of 2022-01-01: 2 positiveWeek of 2022-01-01: 1 negativeWeek of 2022-02-01: 1 positiveWeek of 2022-02-01: 1 negativeWeek of 2022-03-01: 2 positiveWeek of 2022-04-01: 3 positiveWeek of 2022-04-01: 1 negativeWeek of 2022-05-01: 1 positiveWeek of 2022-06-01: 3 positiveWeek of 2022-07-01: 2 positiveWeek of 2022-08-01: 1 positiveWeek of 2022-08-01: 1 negativeWeek of 2022-09-01: 2 positiveWeek of 2022-11-01: 2 positiveWeek of 2022-12-01: 2 positiveWeek of 2023-01-01: 9 positiveWeek of 2023-01-01: 1 negativeWeek of 2023-02-01: 2 positiveWeek of 2023-02-01: 1 negativeWeek of 2023-03-01: 4 positiveWeek of 2023-04-01: 1 positiveWeek of 2023-05-01: 3 positiveWeek of 2023-06-01: 1 positiveWeek of 2023-07-01: 2 positiveWeek of 2023-08-01: 6 positiveWeek of 2023-09-01: 2 positiveWeek of 2023-10-01: 1 positiveWeek of 2023-11-01: 1 positiveWeek of 2023-11-01: 1 negativeWeek of 2023-12-01: 2 positiveWeek of 2024-01-01: 4 positiveWeek of 2024-02-01: 5 positiveWeek of 2024-03-01: 3 positiveWeek of 2024-03-01: 1 negativeWeek of 2024-04-01: 6 positiveWeek of 2024-05-01: 3 positiveWeek of 2024-06-01: 2 positiveWeek of 2024-07-01: 6 positiveWeek of 2024-08-01: 2 positiveWeek of 2024-09-01: 2 positiveWeek of 2024-10-01: 2 positiveWeek of 2024-11-01: 6 positiveWeek of 2024-12-01: 7 positiveWeek of 2025-01-01: 2 positiveWeek of 2025-02-01: 1 positiveWeek of 2025-03-01: 2 positiveWeek of 2025-03-01: 1 negativeWeek of 2025-04-01: 2 positiveWeek of 2025-04-01: 1 negativeWeek of 2025-05-01: 2 positiveWeek of 2025-06-01: 4 positiveWeek of 2025-07-01: 1 positiveWeek of 2025-07-01: 3 negativeWeek of 2025-08-01: 1 negativeWeek of 2025-09-01: 2 positiveWeek of 2025-10-01: 2 positiveWeek of 2025-11-01: 2 positiveWeek of 2025-12-01: 1 positiveWeek of 2026-01-01: 4 positiveWeek of 2026-02-01: 2 positiveWeek of 2026-03-01: 3 positiveWeek of 2026-03-01: 1 negativeWeek of 2026-04-01: 4 positiveWeek of 2026-05-01: 7 positiveWeek of 2026-05-01: 1 negativeWeek of 2026-06-01: 3 positiveWeek of 2026-06-01: 1 negativeWeek of 2026-07-01: 1 positiveWeek of 2026-08-01: 4 positive
Weekly review counts (Steam review histogram). Positive above the line, negative below.

Players online

1302026-09-15 07:00 — 11 players2026-09-16 15:00 — 8 players2026-09-17 23:00 — 13 players2026-09-19 06:00 — 7 players2026-09-20 14:00 — 11 players2026-09-21 22:00 — 8 players2026-09-23 05:00 — 5 players2026-09-24 13:00 — 6 players2026-09-25 20:00 — 8 players2026-09-27 04:00 — 5 players2026-09-28 11:00 — 7 players2026-09-29 19:00 — 5 players2026-10-01 02:00 — 5 players2026-10-02 10:00 — 4 players2026-10-03 17:00 — 10 players2026-10-05 01:00 — 5 players2026-10-06 09:00 — 7 players2026-10-07 16:00 — 5 players2026-10-09 00:00 — 10 players2026-10-10 07:00 — 5 players2026-10-11 15:00 — 7 players2026-10-12 23:00 — 7 players2026-10-14 06:00 — 7 players
Concurrent players, hourly average, last 30 days (census samples).
133Jul 2012Aug 2026Jul 2012 — avg 4 · peak 11Dec 2012 — avg 4 · peak 11May 2013 — avg 4 · peak 10Oct 2013 — avg 5 · peak 13Mar 2014 — avg 5 · peak 13Aug 2014 — avg 4 · peak 11Jan 2015 — avg 5 · peak 12Jun 2015 — avg 4 · peak 11Nov 2015 — avg 4 · peak 11Apr 2016 — avg 6 · peak 13Sep 2016 — avg 4 · peak 11Feb 2017 — avg 4 · peak 11Jul 2017 — avg 4 · peak 11Dec 2017 — avg 6 · peak 20May 2018 — avg 6 · peak 16Oct 2018 — avg 8 · peak 17Mar 2019 — avg 9 · peak 17Aug 2019 — avg 7 · peak 15Jan 2020 — avg 7 · peak 18Jun 2020 — avg 7 · peak 16Nov 2020 — avg 9 · peak 19Apr 2021 — avg 8 · peak 16Sep 2021 — avg 8 · peak 17Feb 2022 — avg 10 · peak 19Jul 2022 — avg 7 · peak 15Dec 2022 — avg 9 · peak 19May 2023 — avg 7 · peak 16Oct 2023 — avg 7 · peak 14Mar 2024 — avg 8 · peak 18Aug 2024 — avg 9 · peak 21Jan 2025 — avg 9 · peak 18Jun 2025 — avg 8 · peak 17Nov 2025 — avg 8 · peak 18Apr 2026 — avg 7 · peak 15Aug 2026 — avg 7 · peak 14
Monthly average players (source: steamcharts.com) — history via steamcharts.com; live census sampling since Aug 2026.

Price history

$4.99$0.002015-01-012017-12-162015-01-01 — best price $4.992015-11-25 — best price $2.492015-12-01 — best price $4.992015-12-22 — best price $2.492016-01-04 — best price $4.992016-02-05 — best price $2.492016-02-12 — best price $4.992017-12-16 — best price $0.00
Lowest recorded price across tracked stores, per day (census snapshots).

Attention

681662026-06-01 — 591 pageviews2026-06-05 — 352 pageviews2026-06-09 — 257 pageviews2026-06-13 — 219 pageviews2026-06-17 — 215 pageviews2026-06-21 — 166 pageviews2026-06-25 — 167 pageviews2026-06-29 — 165 pageviews2026-07-03 — 329 pageviews2026-07-07 — 312 pageviews2026-07-11 — 142 pageviews2026-07-15 — 134 pageviews2026-07-19 — 103 pageviews2026-07-23 — 116 pageviews2026-07-27 — 107 pageviews2026-07-31 — 110 pageviews2026-08-04 — 89 pageviews2026-08-08 — 112 pageviews2026-08-12 — 80 pageviews2026-08-16 — 106 pageviews2026-08-20 — 113 pageviews2026-08-24 — 112 pageviews2026-08-28 — 90 pageviews2026-09-01 — 100 pageviews2026-09-05 — 87 pageviews2026-09-09 — 81 pageviews2026-09-13 — 93 pageviews2026-09-17 — 85 pageviews2026-09-21 — 87 pageviews2026-09-25 — 108 pageviews2026-09-29 — 100 pageviews2026-10-03 — 80 pageviews2026-10-07 — 74 pageviews2026-10-10 — 66 pageviews
Daily Wikipedia pageviews (attention proxy, census-recorded).

Details

WindowsSingle-playerFamily Sharing

1 supported languages: English

Player tags

IndieCasualPuzzleRelaxingFree to PlaySingleplayer

Census log

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

Players also track

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Similarity via IGDB.

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