Can you trust Portal's Steam reviews? Adjusted rating 98.6%

Release date: 2007年10月10日 View on Steam

Official Steam rating
98.5%
200,396 reviews
Adjusted rating
98.6%
95% range 98.5%–98.6%
vs official +0.1pt
Japanese-language reviews
95.2%
974 reviews
vs overall −3.4pt

Genuinely great 400 positive and 400 negative reviews analyzed · data as of 2026-10-12

Summary

The adjusted rating for Portal is 98.6% (95% range 98.5–98.6%), in line with the official 98.5% on Steam. It is based on 400 positive and 400 negative reviews weighted by trust. Verdict: "Genuinely great" (the adjusted rating is 70% or higher and the positive reviews carry high average trust).

Positive reviews average 0.79 in trust and negative ones 0.76; the difference shifts the rating by less than one point. The most common discount factor is very short reviews (36% overall).

Across 193 months of history, no month shows a concentrated wave of negative reviews. There is no sign of coordinated review activity.

The last 180 days show 98.3% (last 30 days: 98.4%), close to the all-time figure.

Japanese-language reviews (974) show 95.2%, close to the overall rating. In the last 180 days, Japanese-language reviews show 92.5%.

The adjusted rating estimates trust from how reviews are written; it does not judge any individual review as fake. Data as of 2026-10-12.

Positive vs negative breakdown

Share of sampled reviews that meet each condition that lowers trust. When a condition is more common on the positive side, the adjusted rating falls below the official one.

ConditionPositive reviewsNegative reviews
Under 2 hours played at review8%26%
Very short text36%30%
Key activated outside Steam5%10%
Received for free2%3%
Owns very few games12%2%
Over 100 reviews written2%7%
Average trust (1.0 = full)0.790.76

The median total playtime of the sampled reviewers is 4.2 hours.

Rating history

Monthly positive and negative review counts since release, as published by Steam.

Reviews per month (green = positive, red = negative)
0 2,000 4,000 6,000 2010-10: +6 / −0 2010-11: +94 / −0 2010-12: +183 / −0 2011-01: +59 / −0 2011-02: +43 / −0 2011-03: +38 / −0 2011-04: +87 / −0 2011-05: +39 / −0 2011-06: +34 / −0 2011-07: +115 / −1 2011-08: +35 / −1 2011-09: +48 / −0 2011-10: +37 / −0 2011-11: +33 / −0 2011-12: +417 / −0 2012-01: +80 / −0 2012-02: +19 / −0 2012-03: +33 / −0 2012-04: +25 / −0 2012-05: +44 / −0 2012-06: +22 / −0 2012-07: +187 / −0 2012-08: +57 / −0 2012-09: +45 / −0 2012-10: +40 / −0 2012-11: +62 / −0 2012-12: +105 / −0 2013-01: +72 / −0 2013-02: +49 / −0 2013-03: +49 / −0 2013-04: +76 / −1 2013-05: +64 / −0 2013-06: +69 / −0 2013-07: +126 / −1 2013-08: +46 / −0 2013-09: +51 / −1 2013-10: +58 / −0 2013-11: +203 / −3 2013-12: +604 / −9 2014-01: +388 / −4 2014-02: +250 / −2 2014-03: +211 / −2 2014-04: +317 / −6 2014-05: +261 / −3 2014-06: +671 / −11 2014-07: +387 / −4 2014-08: +368 / −4 2014-09: +327 / −5 2014-10: +341 / −3 2014-11: +267 / −6 2014-12: +626 / −12 2015-01: +512 / −9 2015-02: +322 / −7 2015-03: +268 / −6 2015-04: +215 / −5 2015-05: +209 / −0 2015-06: +672 / −13 2015-07: +329 / −7 2015-08: +253 / −1 2015-09: +184 / −4 2015-10: +198 / −5 2015-11: +601 / −15 2015-12: +831 / −28 2016-01: +707 / −20 2016-02: +516 / −12 2016-03: +357 / −4 2016-04: +254 / −3 2016-05: +253 / −6 2016-06: +495 / −8 2016-07: +575 / −18 2016-08: +273 / −12 2016-09: +234 / −10 2016-10: +245 / −9 2016-11: +1,671 / −11 2016-12: +743 / −18 2017-01: +728 / −24 2017-02: +399 / −5 2017-03: +322 / −7 2017-04: +252 / −10 2017-05: +259 / −6 2017-06: +1,251 / −28 2017-07: +1,604 / −36 2017-08: +533 / −23 2017-09: +380 / −11 2017-10: +362 / −14 2017-11: +1,575 / −14 2017-12: +1,241 / −25 2018-01: +1,110 / −31 2018-02: +745 / −18 2018-03: +543 / −15 2018-04: +344 / −6 2018-05: +426 / −9 2018-06: +762 / −15 2018-07: +888 / −22 2018-08: +379 / −7 2018-09: +279 / −11 2018-10: +237 / −10 2018-11: +1,096 / −26 2018-12: +578 / −12 2019-01: +547 / −10 2019-02: +498 / −17 2019-03: +307 / −12 2019-04: +258 / −7 2019-05: +306 / −4 2019-06: +1,632 / −15 2019-07: +1,994 / −38 2019-08: +320 / −8 2019-09: +267 / −5 2019-10: +296 / −7 2019-11: +1,287 / −14 2019-12: +2,302 / −25 2020-01: +1,658 / −13 2020-02: +974 / −12 2020-03: +1,338 / −21 2020-04: +1,634 / −20 2020-05: +1,370 / −11 2020-06: +1,565 / −20 2020-07: +2,604 / −26 2020-08: +1,291 / −18 2020-09: +1,049 / −20 2020-10: +1,010 / −19 2020-11: +1,818 / −28 2020-12: +2,377 / −31 2021-01: +2,354 / −22 2021-02: +1,308 / −12 2021-03: +1,186 / −13 2021-04: +1,254 / −10 2021-05: +1,276 / −11 2021-06: +1,593 / −27 2021-07: +2,442 / −38 2021-08: +1,386 / −19 2021-09: +914 / −22 2021-10: +790 / −17 2021-11: +1,556 / −20 2021-12: +2,186 / −40 2022-01: +2,379 / −29 2022-02: +1,685 / −39 2022-03: +1,362 / −27 2022-04: +1,116 / −15 2022-05: +1,066 / −12 2022-06: +1,406 / −28 2022-07: +1,982 / −39 2022-08: +1,170 / −19 2022-09: +989 / −11 2022-10: +1,011 / −22 2022-11: +2,379 / −26 2022-12: +4,091 / −72 2023-01: +3,045 / −49 2023-02: +1,364 / −25 2023-03: +3,601 / −47 2023-04: +1,887 / −21 2023-05: +1,776 / −36 2023-06: +1,443 / −31 2023-07: +3,342 / −52 2023-08: +2,210 / −50 2023-09: +2,315 / −33 2023-10: +1,403 / −30 2023-11: +2,177 / −36 2023-12: +2,467 / −48 2024-01: +3,387 / −85 2024-02: +2,132 / −38 2024-03: +2,383 / −41 2024-04: +1,399 / −25 2024-05: +1,637 / −37 2024-06: +1,848 / −69 2024-07: +3,157 / −57 2024-08: +1,669 / −35 2024-09: +1,079 / −24 2024-10: +2,071 / −46 2024-11: +1,805 / −33 2024-12: +2,595 / −55 2025-01: +2,019 / −40 2025-02: +1,296 / −35 2025-03: +1,816 / −33 2025-04: +1,106 / −23 2025-05: +1,159 / −21 2025-06: +1,887 / −38 2025-07: +2,018 / −38 2025-08: +1,428 / −25 2025-09: +965 / −26 2025-10: +1,504 / −16 2025-11: +2,168 / −17 2025-12: +2,083 / −27 2026-01: +2,265 / −34 2026-02: +1,204 / −17 2026-03: +1,625 / −32 2026-04: +1,296 / −17 2026-05: +1,166 / −25 2026-06: +1,360 / −26 2026-07: +2,199 / −38 2026-08: +1,264 / −24 2026-09: +1,032 / −21 2026-10: +860 / −11 2010/102011/012012/012013/012014/012015/012016/012017/012018/012019/012020/012021/012022/012023/012024/012025/012026/01
Positive share per month (months under 30 reviews omitted)
0% 25% 50% 75% 100% Monthly data overall 98.3% 2010-11: 100.0%2010-12: 100.0%2011-01: 100.0%2011-02: 100.0%2011-03: 100.0%2011-04: 100.0%2011-05: 100.0%2011-06: 100.0%2011-07: 99.1%2011-08: 97.2%2011-09: 100.0%2011-10: 100.0%2011-11: 100.0%2011-12: 100.0%2012-01: 100.0%2012-03: 100.0%2012-05: 100.0%2012-07: 100.0%2012-08: 100.0%2012-09: 100.0%2012-10: 100.0%2012-11: 100.0%2012-12: 100.0%2013-01: 100.0%2013-02: 100.0%2013-03: 100.0%2013-04: 98.7%2013-05: 100.0%2013-06: 100.0%2013-07: 99.2%2013-08: 100.0%2013-09: 98.1%2013-10: 100.0%2013-11: 98.5%2013-12: 98.5%2014-01: 99.0%2014-02: 99.2%2014-03: 99.1%2014-04: 98.1%2014-05: 98.9%2014-06: 98.4%2014-07: 99.0%2014-08: 98.9%2014-09: 98.5%2014-10: 99.1%2014-11: 97.8%2014-12: 98.1%2015-01: 98.3%2015-02: 97.9%2015-03: 97.8%2015-04: 97.7%2015-05: 100.0%2015-06: 98.1%2015-07: 97.9%2015-08: 99.6%2015-09: 97.9%2015-10: 97.5%2015-11: 97.6%2015-12: 96.7%2016-01: 97.2%2016-02: 97.7%2016-03: 98.9%2016-04: 98.8%2016-05: 97.7%2016-06: 98.4%2016-07: 97.0%2016-08: 95.8%2016-09: 95.9%2016-10: 96.5%2016-11: 99.3%2016-12: 97.6%2017-01: 96.8%2017-02: 98.8%2017-03: 97.9%2017-04: 96.2%2017-05: 97.7%2017-06: 97.8%2017-07: 97.8%2017-08: 95.9%2017-09: 97.2%2017-10: 96.3%2017-11: 99.1%2017-12: 98.0%2018-01: 97.3%2018-02: 97.6%2018-03: 97.3%2018-04: 98.3%2018-05: 97.9%2018-06: 98.1%2018-07: 97.6%2018-08: 98.2%2018-09: 96.2%2018-10: 96.0%2018-11: 97.7%2018-12: 98.0%2019-01: 98.2%2019-02: 96.7%2019-03: 96.2%2019-04: 97.4%2019-05: 98.7%2019-06: 99.1%2019-07: 98.1%2019-08: 97.6%2019-09: 98.2%2019-10: 97.7%2019-11: 98.9%2019-12: 98.9%2020-01: 99.2%2020-02: 98.8%2020-03: 98.5%2020-04: 98.8%2020-05: 99.2%2020-06: 98.7%2020-07: 99.0%2020-08: 98.6%2020-09: 98.1%2020-10: 98.2%2020-11: 98.5%2020-12: 98.7%2021-01: 99.1%2021-02: 99.1%2021-03: 98.9%2021-04: 99.2%2021-05: 99.1%2021-06: 98.3%2021-07: 98.5%2021-08: 98.6%2021-09: 97.6%2021-10: 97.9%2021-11: 98.7%2021-12: 98.2%2022-01: 98.8%2022-02: 97.7%2022-03: 98.1%2022-04: 98.7%2022-05: 98.9%2022-06: 98.0%2022-07: 98.1%2022-08: 98.4%2022-09: 98.9%2022-10: 97.9%2022-11: 98.9%2022-12: 98.3%2023-01: 98.4%2023-02: 98.2%2023-03: 98.7%2023-04: 98.9%2023-05: 98.0%2023-06: 97.9%2023-07: 98.5%2023-08: 97.8%2023-09: 98.6%2023-10: 97.9%2023-11: 98.4%2023-12: 98.1%2024-01: 97.6%2024-02: 98.2%2024-03: 98.3%2024-04: 98.2%2024-05: 97.8%2024-06: 96.4%2024-07: 98.2%2024-08: 97.9%2024-09: 97.8%2024-10: 97.8%2024-11: 98.2%2024-12: 97.9%2025-01: 98.1%2025-02: 97.4%2025-03: 98.2%2025-04: 98.0%2025-05: 98.2%2025-06: 98.0%2025-07: 98.2%2025-08: 98.3%2025-09: 97.4%2025-10: 98.9%2025-11: 99.2%2025-12: 98.7%2026-01: 98.5%2026-02: 98.6%2026-03: 98.1%2026-04: 98.7%2026-05: 97.9%2026-06: 98.1%2026-07: 98.3%2026-08: 98.1%2026-09: 98.0%2026-10: 98.7% 2010/102011/012012/012013/012014/012015/012016/012017/012018/012019/012020/012021/012022/012023/012024/012025/012026/01
Reviews per day, last 30 days
0 50 100 2026-09-13: +35 / −0 2026-09-14: +34 / −1 2026-09-15: +36 / −0 2026-09-16: +33 / −0 2026-09-17: +32 / −0 2026-09-18: +36 / −1 2026-09-19: +47 / −0 2026-09-20: +35 / −0 2026-09-21: +36 / −3 2026-09-22: +37 / −0 2026-09-23: +28 / −1 2026-09-24: +29 / −2 2026-09-25: +20 / −0 2026-09-26: +39 / −1 2026-09-27: +34 / −0 2026-09-28: +42 / −0 2026-09-29: +29 / −0 2026-09-30: +26 / −1 2026-10-01: +32 / −0 2026-10-02: +58 / −1 2026-10-03: +78 / −2 2026-10-04: +98 / −1 2026-10-05: +62 / −2 2026-10-06: +84 / −0 2026-10-07: +97 / −1 2026-10-08: +85 / −2 2026-10-09: +75 / −0 2026-10-10: +82 / −1 2026-10-11: +92 / −1 2026-10-12: +17 / −0 09/1309/2009/2710/0410/11

Recent sentiment

PeriodPositiveReviews
Last 30 days98.4%1,614
Last 180 days98.3%9,153
All time98.5%200,396
Japanese, last 180 days92.5%40

About this verdict

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