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Category Theory Illustrated – Orders

https://abuseofnotation.github.io/category-theory-illustrated/04_order/
39•boris_m•2h ago•9 comments

Amiga Graphics

https://amiga.lychesis.net/
32•sph•2h ago•1 comments

Show HN: I made a calculator that works over disjoint sets of intervals

https://victorpoughon.github.io/interval-calculator/
138•fouronnes3•7h ago•21 comments

Claude Design

https://www.anthropic.com/news/claude-design-anthropic-labs
1022•meetpateltech•17h ago•669 comments

The simple geometry behind any road

https://sandboxspirit.com/blog/simple-geometry-of-roads/
19•azhenley•2d ago•3 comments

Measuring Claude 4.7's tokenizer costs

https://www.claudecodecamp.com/p/i-measured-claude-4-7-s-new-tokenizer-here-s-what-it-costs-you
601•aray07•17h ago•427 comments

Towards trust in Emacs

https://eshelyaron.com/posts/2026-04-15-towards-trust-in-emacs.html
97•eshelyaron•2d ago•11 comments

All 12 moonwalkers had "lunar hay fever" from dust smelling like gunpowder (2018)

https://www.esa.int/Science_Exploration/Human_and_Robotic_Exploration/The_toxic_side_of_the_Moon
324•cybermango•14h ago•189 comments

Rewriting Every Syscall in a Linux Binary at Load Time

https://amitlimaye1.substack.com/p/rewriting-every-syscall-in-a-linux
38•riteshnoronha16•4d ago•13 comments

Spending 3 months coding by hand

https://miguelconner.substack.com/p/im-coding-by-hand
200•evakhoury•16h ago•197 comments

A simplified model of Fil-C

https://www.corsix.org/content/simplified-model-of-fil-c
171•aw1621107•11h ago•87 comments

It is incorrect to "normalize" // in HTTP URL paths

https://runxiyu.org/comp/doubleslash/
21•pabs3•2h ago•10 comments

Are the costs of AI agents also rising exponentially? (2025)

https://www.tobyord.com/writing/hourly-costs-for-ai-agents
194•louiereederson•2d ago•48 comments

Brunost: The Nynorsk Programming Language

https://lindbakk.com/blog/introducing-brunost
56•atomfinger•4d ago•22 comments

Show HN: Smol machines – subsecond coldstart, portable virtual machines

https://github.com/smol-machines/smolvm
326•binsquare•15h ago•99 comments

Slop Cop

https://awnist.com/slop-cop
171•ericHosick•17h ago•100 comments

Show HN: PanicLock – Close your MacBook lid disable TouchID –> password unlock

https://github.com/paniclock/paniclock/
186•seanieb•16h ago•78 comments

"cat readme.txt" is not safe if you use iTerm2

https://blog.calif.io/p/mad-bugs-even-cat-readmetxt-is-not
173•arkadiyt•14h ago•93 comments

Hyperscalers have already outspent most famous US megaprojects

https://twitter.com/finmoorhouse/status/2044933442236776794
188•nowflux•16h ago•147 comments

Middle schooler finds coin from Troy in Berlin

https://www.thehistoryblog.com/archives/75848
228•speckx•18h ago•102 comments

NASA Force

https://nasaforce.gov/
268•LorenDB•16h ago•266 comments

Landmark ancient-genome study shows surprise acceleration of human evolution

https://www.nature.com/articles/d41586-026-01204-5
75•unsuspecting•10h ago•61 comments

Making Wax Sealed Letters at Scale

https://waxletter.com/
16•hjconstas•2d ago•12 comments

NIST gives up enriching most CVEs

https://risky.biz/risky-bulletin-nist-gives-up-enriching-most-cves/
198•mooreds•17h ago•50 comments

Casus Belli Engineering

https://marcosmagueta.com/blog/casus-belli-engineering/
34•b-man•7h ago•7 comments

The Unix executable as a Smalltalk method (2025) [video]

https://www.youtube.com/watch?v=sZjPQ7vtLNA
52•surprisetalk•1d ago•3 comments

Introducing: ShaderPad

https://rileyjshaw.com/blog/introducing-shaderpad/
91•evakhoury•2d ago•18 comments

Arc Prize Foundation (YC W26) Is Hiring a Platform Engineer for ARC-AGI-4

https://www.ycombinator.com/companies/arc-prize-foundation/jobs/AKZRZDN-platform-engineer-benchma...
1•gkamradt_•11h ago

The GNU libc atanh is correctly rounded

https://inria.hal.science/hal-05591661
89•matt_d•3d ago•19 comments

Ban the sale of precise geolocation

https://www.lawfaremedia.org/article/it-is-time-to-ban-the-sale-of-precise-geolocation
693•hn_acker•18h ago•176 comments
Open in hackernews

Show HN: Reverse Pac-Man

https://reverse-pacman.staticrun.app/index
78•Eagle64•11mo ago
Keep one eye on the first ghost and the other on the second

Comments

brudgers•11mo ago
I can't see the whole screen on my laptop, and the screen doesn't scroll.
Eagle64•11mo ago
Thanks for the feedback. It is fixed
pmontra•11mo ago
It's one of those things that "why did nobody think about it yet?!"
toast0•11mo ago
Pac-Man Vs. [1] was a commercial game on this wavelength. I don't think I ever played that one.

[1] https://en.wikipedia.org/wiki/Pac-Man_Vs.

jaimebuelta•11mo ago
I was going to say the same thing. Pac-Man Vs was incredibly fun and a great party game.
thih9•11mo ago
Fixed link: https://en.m.wikipedia.org/wiki/Pac-Man_Vs%2E

(trailing dot escaped via %2E)

roskelld•11mo ago
One Little Ghost (2012) [1] [2] for the ZX81 is one version I only recently found out about. Figured it was worth mentioning here given how impressive it is for a game on the humble ZX81 machine that's well over 40 years old.

[1] https://bobs-stuff.itch.io/one-little-ghost

[2] https://www.youtube.com/watch?v=Rq2hOlC97SQ

iorekz•11mo ago
genius
Eagle64•11mo ago
Haha. I’ll take the compliment.
roskelld•11mo ago
Are you planning on adding the power pills to give Pac Man a fighting chance?

Also, I noticed that he often circles around the upper left area a few times at the start even though there are no dots to collect.

Eagle64•11mo ago
Good idea ! That will add a new cool dynamic. The behavior of the Pac-Man is to avoid the ghost with some random pattern added. This might happen.
xnx•11mo ago
Very cool. Gemini is such a fun tool to do a one-shot MVP of a game like this: https://g.co/gemini/share/7639ee864df7

Gemini wasn't clever enough to disallow ghosts changing directions mid-way, but it did do a smart thing with "pellets remaining" scoring.

Eagle64•11mo ago
Really ? Even if you specify that ghosts can turn only at intersections?
xnx•11mo ago
I'm sure it could. I was very unspecified with my prompt (below). No doubt it could add sound, etc. as well.

Prompt: Create a game of Pacman with only 2 ghosts. Instead of the player controlling pacman, the player controls the ghosts.

Controls: Ghost 1 (Red): WASD or ZQSD Ghost 2 (Cyan): Arrow Keys

amadeuspagel•11mo ago
Awesome. It's mind-bending to control two players. The idea of using arrow keys to control one player and WASD to control another is genius. Maybe you can visualize which is which by coloring the explanatory text.
eesmith•11mo ago
I used to solo play 2-player Gauntlet for the PC this way, back around 1990.

In the 1980s it was pretty common to have 2-player games with both players on the same keyboard.

Edit: Spacewar (see https://archive.org/details/msdos_Spacewar_1985) is an example of a two-player-on-one-keyboard game, from 1985.

redbluething•11mo ago
Yellow Wizard Needs Food Badly!
chrisweekly•11mo ago
Warrior is about to die!

man that takes me back

CloudNetPro•11mo ago
Me and my friends used to play 3 player simultaneously in D-Zone. Obviously we had to be kind with each other about space around the keyboard and about key presses. Still one of the best gaming experiences I ever had.

https://www.mobygames.com/game/69231/destruction-zone/

vunderba•11mo ago
I built a dual snake game where you simultaneously control two snakes a while back, perhaps I should do a Show HN about it at some point.

https://specularrealms.itch.io/the-twins-of-caduceus

Fair warning: It's a game made for people who excel at ambidextrous tasks like patting one's head and rubbing one's tummy, or juggling Rubik's cubes that you are also solving.

KennedyHere•11mo ago
Fun game! From the title, I was expecting to guide Pac-Man to put all the dots back in place.
Eagle64•11mo ago
Haha. I haven’t thought of this. That would be a cool other mode
GlassOwAter•11mo ago
Poo-Man or Puke-Man
xnx•11mo ago
Crap-Man?
vunderba•11mo ago
While that would be amusing, mechanically it would be identical to the original game.
derefr•11mo ago
Not really. Presume that everything is time-reversed, and the game kills you if you do anything not possible when your playback is flipped around and played "forward." Then:

- Obviously, you "emit" dots and fruit and power pellets as you traverse the grid.

- Less obviously, once you populate a dot/fruit/power pellet onto a grid square, you can't visit that position again — as, if reversed, that'd look like you going over those things without collecting them.

- You'd randomly enter the powered-up state, and you'd then have to visit one of the unpopulated power-pellet grid positions in order to emit the power pellet to get out of that state — before the powered-up-state timer expires. (The power-up-state going on longer than that is invalid!)

- While in the powered-up state, you'd see pairs of ghost eyes unavoidably approaching you; they'd touch you, turn into ghosts, and then flee from you. That's fine. But once they become ghosts and move off of the grid-space you occupy, you can't touch them again.

LocalH•11mo ago
Idea for a "challenge mode" on top of that, since this would probably be too hard for casual play:

A series of levels where you are given a score at the beginning. You must find the path around the map that brings your score exactly to zero, using reverse Pac-Man scoring rules (each dot you lay reduces your score by 10, etc). If you reach zero with more dots to lay, or finish laying down all dots without reaching zero, you die (as those would also be invalid states).

Recording input for these challenge runs would be a cool idea too, as you could have the option to watch the run "forwards" for further entertainment. To lessen the difficulty a little bit, the player could even have access to the "forward" version of a run that completes the desired score target (with appropriate bonuses for players who don't utilize the "hint" run).

alnwlsn•11mo ago
For that, you want this rom hack/patch

http://48k.ca/bacman.html

mrighele•11mo ago
Me too, also because I remember playing that kind of game, on a Creativision, more than 40 years ago [1]

[1] https://archive.org/details/Crazy_Chicky_1981_VTL

mtVessel•11mo ago
On FF (similar on Edge):

Secure Connection Failed

An error occurred during a connection to reverse-pacman.staticrun.app. PR_END_OF_FILE_ERROR

Eagle64•11mo ago
Thanks for letting me know. There is a problem with the host. I moved it to itch.io https://themarelle.itch.io/reverse-pac-man
kmoser•11mo ago
On Firefox it freezes on the keyboard instructions screen for me. Console shows it requires WebGL. Maybe put a message on screen indicating that?
xnx•11mo ago
Would be fun to have dual stick controller support: https://developer.mozilla.org/en-US/docs/Web/API/Gamepad_API
tantalor•11mo ago
You should make it so user can hold down a key to change direction before they reach the intersection, joystick style.

As it is, it feels like you are checking for key press (not key down) in a narrow window when the ghost reaches the intersection. That is very hard to play. It is much more forgiving if I can press and hold the key whenever I want.

Eagle64•11mo ago
Thank you for the suggestion. Your wish has been granted. It is definitely better like this.
tantalor•11mo ago
Yes! thanks
bentcorner•11mo ago
For anyone interested in this style of gameplay mechanic, the game Brothers - A Tale of Two Sons (steam: https://store.steampowered.com/app/225080/Brothers__A_Tale_o...) uses a twin-stick approach to this, and builds puzzles around controlling two "people".

It's a quick play and the game is pretty good, I recommend experiencing it.

bitwize•11mo ago
That game was an emotional journey, man. Very short as these games go, but it hit hard.

And the music was by Gustaf Grefberg, "Lizardking", my favorite oldskool demo musician by a mile.

progforlyfe•11mo ago
It's not loading at all for me. Hug of death?
Eagle64•11mo ago
Even with this link ? https://themarelle.itch.io/reverse-pac-man
narcindin•11mo ago
Reminds me of a demo I played 10 years ago called swap box turbo. Designed for two players, it is a simple platformer where you and your partner swap positions and momentum every 3 seconds.

You can play it single player too and have an experience similar to this.

https://www.freeindiegam.es/2012/12/swap-box-turbo-nifflas/

kazinator•11mo ago
The ghosts don't respond to a key until they encounter to an intersection, so that you cannot reverse direction instantly. Maybe there is a deliberate point to that, but it doesn't make it less annoying.
adamiscool8•11mo ago
I like the concept but shouldn't the score be counting down? Or am I trying to shepherd Pac-Man into eating as many as possible to get a high score?
lostmsu•11mo ago
The game screen is cut on the right when browser window is small.
nprateem•11mo ago
This was why I liked opposing force. Give NPCs their own backstory and make them playable.
staticman2•11mo ago
Nintendo did something like this with "Pacman vs" for GameCube. The multiplayer gimmick was the players controlling the ghosts couldn't see the entire map and the player controlling Pacman could with a Game Boy Advanced linked to the Gamecube.
thih9•11mo ago
The game is also available on nintendo switch and it supports multiplayer with that same gimmick, with two devices.

https://en.m.wikipedia.org/wiki/Pac-Man_Vs%2E