A Slower Speed of Light by MIT Game Lab
Ranked 4 of 4 physics games by recommenders
Free game people call mind-blowing in physics classes and interesting to play. One critic found problems modeling relativistic Doppler timing.
Free game people call mind-blowing in physics classes and interesting to play. One critic found problems modeling relativistic Doppler timing.
6 people gave an opinion
- recommend it
- 5
- criticize it
- 1
- approval share
- 83%
Recommended in 2 of 13 months
- November 2025: not recommended
- December 2025: not recommended
- January 2026: recommended
- February 2026: not recommended
- March 2026: not recommended
- April 2026: not recommended
- May 2026: not recommended
- June 2026: not recommended
- July 2026: not recommended
- August 2026: not recommended
- September 2026: recommended
- October 2026: not recommended
- November 2026: not recommended (month in progress)
Why it doesn’t carry the badge
- 5 people recommend itNeeds 10 or more, not met.
- 5 recommenders for every criticNeeds 2 to 1 or better, met.
- Recommended in 2 of 13 monthsNeeds 4 or more, not met.
The same three rules apply to every product, and the badge can’t be bought. How the badge works
What people say about it
The reasons people give, with the number of comments that give each one. Open a reason to read what they said.
Why people recommend it
Each mark is one comment
Mind-blowing in physics classes
“Loved that game!! Blew my mind in my 1st year physics classes”
Comment from 10 Sep 2026 in “Show HN: What if the speed of light was 5 km/h?” Interesting to play with
“Played around with this one before. Very interesting.”
Comment from 10 Sep 2026 in “Show HN: What if the speed of light was 5 km/h?” Great demo video available
“There's a great demo video of it as well.”
Comment from 10 Sep 2026 in “Show HN: What if the speed of light was 5 km/h?”
What people warn about
Each mark is one comment
Problems modeling relativistic Doppler timing
“the issue that I found was with modeling temporal aspects of relativistic doppler”
Comment from 10 Sep 2026 in “Show HN: What if the speed of light was 5 km/h?”
Other physics games people recommend
The three most recommended other physics games, with the same counts for each, so you can compare like for like. The tick on each bar marks the 2 to 1 line the badge needs.
| Product | Recommend | Criticize | Approval | Months | Owned | Badge |
|---|---|---|---|---|---|---|
| Hole Punch | 27 | 7 | 79% | 5 | — | Approved |
| Sandboxels | 10 | 2 | 83% | 1 | — | — |
| 2D Vehicles | 6 | 1 | 86% | 1 | — | — |
| A Slower Speed of Light by MIT Game LabThis page | 5 | 1 | 83% | 2 | — | — |
What people said
4 of the 6 comments that mention it, newest first. Each links to the original comment.
“the issue that I found was with modeling temporal aspects of relativistic doppler”
“Played around with this one before. Very interesting.”
“Loved that game!! Blew my mind in my 1st year physics classes”
“There's a great demo video of it as well.”
Counts come from 1,795,640 Hacker News comments, November 2025 to November 2026. How we count. Report a mistake.