The Game Census
SAS: Zombie Assault 4 cover art

SAS: Zombie Assault 4

Ninja Kiwi · 2017-10-16

Steam

ActionRPGFree To Play

Modes: Single player, Multiplayer, Co-operative

Releases: Oct 16, 2017 (Mac), Aug 11, 2014 (Web browser), Oct 16, 2017 (PC (Microsoft Windows)), Oct 23, 2014 (iOS), Oct 17, 2014 (Android)

Purge the undead! Intense action-shooter with deep rpg elements, including upgradeable guns and armor, unique class skills, and class special abilities. Entire game can be played single player or as a 4-player online co-op game, including PvP events like Last Man Standing.

141
playing now
86%
positive of 9.7k reviews
Very Positive
steam rating
1,000,000–2,000,000
owners (SteamSpy est.)
gold
deck/linux tier (ProtonDB)
Free
steam price (US)

141 players in-game as of 2026-08-30 17:00 UTC (census sample)

Health check

Healthy
  • · 141 players in-game at the last census sample.
  • · 410 reviews in the last 8 weeks (~51/week).
  • · Review velocity down 21% vs the prior 8 weeks.
  • · Top 11% of 10,936 Action games in the census by review count.

Health tier since 2026-08-27

Review momentum

PositiveNegative
16716720182026Week of 2018-01-01: 152 positiveWeek of 2018-01-01: 23 negativeWeek of 2018-02-01: 74 positiveWeek of 2018-02-01: 21 negativeWeek of 2018-03-01: 57 positiveWeek of 2018-03-01: 20 negativeWeek of 2018-04-01: 61 positiveWeek of 2018-04-01: 19 negativeWeek of 2018-05-01: 70 positiveWeek of 2018-05-01: 18 negativeWeek of 2018-06-01: 71 positiveWeek of 2018-06-01: 20 negativeWeek of 2018-07-01: 61 positiveWeek of 2018-07-01: 24 negativeWeek of 2018-08-01: 75 positiveWeek of 2018-08-01: 11 negativeWeek of 2018-09-01: 50 positiveWeek of 2018-09-01: 18 negativeWeek of 2018-10-01: 66 positiveWeek of 2018-10-01: 11 negativeWeek of 2018-11-01: 106 positiveWeek of 2018-11-01: 21 negativeWeek of 2018-12-01: 66 positiveWeek of 2018-12-01: 14 negativeWeek of 2019-01-01: 52 positiveWeek of 2019-01-01: 11 negativeWeek of 2019-02-01: 48 positiveWeek of 2019-02-01: 7 negativeWeek of 2019-03-01: 49 positiveWeek of 2019-03-01: 10 negativeWeek of 2019-04-01: 45 positiveWeek of 2019-04-01: 14 negativeWeek of 2019-05-01: 55 positiveWeek of 2019-05-01: 11 negativeWeek of 2019-06-01: 108 positiveWeek of 2019-06-01: 18 negativeWeek of 2019-07-01: 111 positiveWeek of 2019-07-01: 23 negativeWeek of 2019-08-01: 68 positiveWeek of 2019-08-01: 9 negativeWeek of 2019-09-01: 48 positiveWeek of 2019-09-01: 9 negativeWeek of 2019-10-01: 39 positiveWeek of 2019-10-01: 18 negativeWeek of 2019-11-01: 167 positiveWeek of 2019-11-01: 14 negativeWeek of 2019-12-01: 104 positiveWeek of 2019-12-01: 11 negativeWeek of 2020-01-01: 110 positiveWeek of 2020-01-01: 10 negativeWeek of 2020-02-01: 100 positiveWeek of 2020-02-01: 14 negativeWeek of 2020-03-01: 117 positiveWeek of 2020-03-01: 15 negativeWeek of 2020-04-01: 137 positiveWeek of 2020-04-01: 11 negativeWeek of 2020-05-01: 110 positiveWeek of 2020-05-01: 17 negativeWeek of 2020-06-01: 80 positiveWeek of 2020-06-01: 18 negativeWeek of 2020-07-01: 110 positiveWeek of 2020-07-01: 15 negativeWeek of 2020-08-01: 82 positiveWeek of 2020-08-01: 10 negativeWeek of 2020-09-01: 82 positiveWeek of 2020-09-01: 12 negativeWeek of 2020-10-01: 81 positiveWeek of 2020-10-01: 14 negativeWeek of 2020-11-01: 102 positiveWeek of 2020-11-01: 16 negativeWeek of 2020-12-01: 97 positiveWeek of 2020-12-01: 9 negativeWeek of 2021-01-01: 120 positiveWeek of 2021-01-01: 13 negativeWeek of 2021-02-01: 96 positiveWeek of 2021-02-01: 21 negativeWeek of 2021-03-01: 124 positiveWeek of 2021-03-01: 19 negativeWeek of 2021-04-01: 118 positiveWeek of 2021-04-01: 18 negativeWeek of 2021-05-01: 110 positiveWeek of 2021-05-01: 8 negativeWeek of 2021-06-01: 100 positiveWeek of 2021-06-01: 11 negativeWeek of 2021-07-01: 105 positiveWeek of 2021-07-01: 23 negativeWeek of 2021-08-01: 114 positiveWeek of 2021-08-01: 17 negativeWeek of 2021-09-01: 92 positiveWeek of 2021-09-01: 14 negativeWeek of 2021-10-01: 109 positiveWeek of 2021-10-01: 16 negativeWeek of 2021-11-01: 126 positiveWeek of 2021-11-01: 16 negativeWeek of 2021-12-01: 116 positiveWeek of 2021-12-01: 10 negativeWeek of 2022-01-01: 119 positiveWeek of 2022-01-01: 9 negativeWeek of 2022-02-01: 104 positiveWeek of 2022-02-01: 22 negativeWeek of 2022-03-01: 108 positiveWeek of 2022-03-01: 12 negativeWeek of 2022-04-01: 103 positiveWeek of 2022-04-01: 11 negativeWeek of 2022-05-01: 126 positiveWeek of 2022-05-01: 26 negativeWeek of 2022-06-01: 123 positiveWeek of 2022-06-01: 10 negativeWeek of 2022-07-01: 92 positiveWeek of 2022-07-01: 12 negativeWeek of 2022-08-01: 76 positiveWeek of 2022-08-01: 17 negativeWeek of 2022-09-01: 132 positiveWeek of 2022-09-01: 13 negativeWeek of 2022-10-01: 103 positiveWeek of 2022-10-01: 13 negativeWeek of 2022-11-01: 103 positiveWeek of 2022-11-01: 12 negativeWeek of 2022-12-01: 98 positiveWeek of 2022-12-01: 14 negativeWeek of 2023-01-01: 82 positiveWeek of 2023-01-01: 14 negativeWeek of 2023-02-01: 69 positiveWeek of 2023-02-01: 18 negativeWeek of 2023-03-01: 92 positiveWeek of 2023-03-01: 10 negativeWeek of 2023-04-01: 87 positiveWeek of 2023-04-01: 16 negativeWeek of 2023-05-01: 77 positiveWeek of 2023-05-01: 7 negativeWeek of 2023-06-01: 84 positiveWeek of 2023-06-01: 12 negativeWeek of 2023-07-01: 94 positiveWeek of 2023-07-01: 17 negativeWeek of 2023-08-01: 71 positiveWeek of 2023-08-01: 13 negativeWeek of 2023-09-01: 53 positiveWeek of 2023-09-01: 4 negativeWeek of 2023-10-01: 59 positiveWeek of 2023-10-01: 10 negativeWeek of 2023-11-01: 72 positiveWeek of 2023-11-01: 6 negativeWeek of 2023-12-01: 67 positiveWeek of 2023-12-01: 11 negativeWeek of 2024-01-01: 76 positiveWeek of 2024-01-01: 11 negativeWeek of 2024-02-01: 58 positiveWeek of 2024-02-01: 17 negativeWeek of 2024-03-01: 74 positiveWeek of 2024-03-01: 9 negativeWeek of 2024-04-01: 81 positiveWeek of 2024-04-01: 7 negativeWeek of 2024-05-01: 55 positiveWeek of 2024-05-01: 12 negativeWeek of 2024-06-01: 77 positiveWeek of 2024-06-01: 7 negativeWeek of 2024-07-01: 66 positiveWeek of 2024-07-01: 11 negativeWeek of 2024-08-01: 56 positiveWeek of 2024-08-01: 11 negativeWeek of 2024-09-01: 71 positiveWeek of 2024-09-01: 8 negativeWeek of 2024-10-01: 73 positiveWeek of 2024-10-01: 7 negativeWeek of 2024-11-01: 82 positiveWeek of 2024-11-01: 12 negativeWeek of 2024-12-01: 74 positiveWeek of 2024-12-01: 12 negativeWeek of 2025-01-01: 55 positiveWeek of 2025-01-01: 9 negativeWeek of 2025-02-01: 57 positiveWeek of 2025-02-01: 9 negativeWeek of 2025-03-01: 68 positiveWeek of 2025-03-01: 19 negativeWeek of 2025-04-01: 53 positiveWeek of 2025-04-01: 10 negativeWeek of 2025-05-01: 58 positiveWeek of 2025-05-01: 9 negativeWeek of 2025-06-01: 70 positiveWeek of 2025-06-01: 11 negativeWeek of 2025-07-01: 50 positiveWeek of 2025-07-01: 11 negativeWeek of 2025-08-01: 77 positiveWeek of 2025-08-01: 10 negativeWeek of 2025-09-01: 45 positiveWeek of 2025-09-01: 7 negativeWeek of 2025-10-01: 41 positiveWeek of 2025-10-01: 15 negativeWeek of 2025-11-01: 41 positiveWeek of 2025-11-01: 9 negativeWeek of 2025-12-01: 52 positiveWeek of 2025-12-01: 13 negativeWeek of 2026-01-01: 31 positiveWeek of 2026-01-01: 8 negativeWeek of 2026-02-01: 46 positiveWeek of 2026-02-01: 9 negativeWeek of 2026-03-01: 44 positiveWeek of 2026-03-01: 4 negativeWeek of 2026-04-01: 49 positiveWeek of 2026-04-01: 7 negativeWeek of 2026-05-01: 47 positiveWeek of 2026-05-01: 7 negativeWeek of 2026-06-01: 39 positiveWeek of 2026-06-01: 6 negativeWeek of 2026-07-01: 36 positiveWeek of 2026-07-01: 12 negativeWeek of 2026-08-01: 27 positiveWeek of 2026-08-01: 11 negative
Weekly review counts (Steam review histogram). Positive above the line, negative below.

Players online

141812026-08-06 21:00 — 105 players2026-08-07 05:00 — 111 players2026-08-07 13:00 — 122 players2026-08-07 21:00 — 105 players2026-08-08 05:00 — 92 players2026-08-08 13:00 — 131 players2026-08-08 21:00 — 119 players2026-08-09 05:00 — 133 players2026-08-09 13:00 — 103 players2026-08-09 21:00 — 122 players2026-08-10 05:00 — 108 players2026-08-10 14:00 — 114 players2026-08-10 22:00 — 135 players2026-08-11 06:00 — 94 players2026-08-11 14:00 — 123 players2026-08-12 21:00 — 104 players2026-08-14 05:00 — 83 players2026-08-15 13:00 — 89 players2026-08-16 21:00 — 125 players2026-08-18 04:00 — 106 players2026-08-19 12:00 — 97 players2026-08-20 19:00 — 133 players2026-08-22 03:00 — 120 players2026-08-23 10:00 — 114 players2026-08-24 18:00 — 121 players2026-08-26 02:00 — 102 players2026-08-27 10:00 — 81 players2026-08-28 17:00 — 119 players2026-08-30 01:00 — 118 players2026-08-30 17:00 — 141 players
Concurrent players, hourly average, last 30 days (census samples).

Completion

60+
achievements tracked
85.2%
earned "Level Up"
3.5%
median achievement earned by

Global achievement rates from Steam.

Details

WindowsmacOSFull controller supportSingle-playerMulti-playerPvPOnline PvPCo-opOnline Co-opCross-Platform MultiplayerSteam AchievementsFull controller supportIn-App Purchases

1 supported languages: English

Console footprint

PlatformPlayers trackedCompletionTrophies/achievements
Steam (Steam)13,7980%64

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

Player tags

2DRPGGoreCo-opActionHorrorShooterZombiesSurvivalTop-Down

Census log

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

Players also track

Immortal: UnchainedBorderlands 3Citadel: Forged with FireShadows: AwakeningRebel Galaxy Outlaw

Similarity via IGDB.

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