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...and to be clear, because of the timeline we're in... This is a game made by people for people. No AI.

Poster with a 3x3 grid of particles, with the nine letters A thru I represented by tiles. Each tile is a particle of the standard model (Bottom, Charm, Down, Electron, Gluon, Higgs), but the letters A, F, and I are blank.
Text: This game has a lot of letters... but A and I don't make the list.

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Agent Higgs 2: Escape from the Standard Model. A particle physics puzzle game/adventure, out everywhere - PC, Mac, Linux, Android - even finally iOS! Chapter 1 takes you through Electricity... coming soon: the rest of particle physics*. testtubegames.com/higgs2.html *no "strings" attached

Movie poster titled Agent Higgs 2: Escape from the Standard Model. Underneath a red Higgs boson wearing groucho marx glasses is surrounded by a variety of particles and blue characters. Underneath, the tagline: time for another run. The particles are listed by name underneath, like actors in a movie poster. At the bottom: Coming August 28, 2026.

Level in Agent Higgs 2, titled Electricity 3. Agent Higgs and a mysterious figure are both in a room with many crates. Two electrons seem seem to be repelling with the help of a photon. The figure says: "The Electric force! Just like in your first, very popular adventure, which of course we all remember."

Large proton tile highlighted in the middle. Titled Field Agent Proton. Underneath a quote: "Do I think we'll escape? Yeah... I'm certain."
Stats listed underneath.
Charge: +1e, Spin: 1/2, Mass: 3 pips, Lifetime: Stable, Team Hadron, Found: In every atom

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Joining the illustrious party...

Four thumbnails of apps, under the heading iPad and iPhone:
Agent Higgs 2, Bond Breaker, Bond Breaker Classroom Edition, and Pocket Slide Rule Expert.

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It's been a looong road...

Tight screenshot of website ui, saying:
iOS App, 1.0.1 Ready for Distribution

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Andy Hall @testtubegames.com · 31/08/2026

It's American Chess Day, as distinct from International Chess Day, because of course it is. So, in some ways, that means it's both Chess Day and *not* Chess Day at the same time. And you know what that means... Time for Quantum Chess! #ScienceHoliday research.cs.queensu.ca/Parallel/Qua...

Chess board with pieces spread out, but on each spot with a piece, there are actually three indicators of what's there. Some of the indicators are different pieces, and some are question marks. Odd stuff is afoot.

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It's Motorist Consideration Day. In the past, I've had a hard time figuring out how to celebrate this one. (I mean, you have to book event spaces months in advance...) So this year, I'll keep it simple - and evolve some cars to see how fast they can go. #ScienceHoliday rednuht.org/genetic_cars...

A bunch of very simple geometric shapes (circles, polygons) stacked together into a bunch of cars, all lined up to race along a path.

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Andy Hall @testtubegames.com · 30/08/2026

It's Slinky Day! To celebrate, go send a wave pulse! (What, slinkies also go down stairs? Never heard that before.) #ScienceHoliday universeandmore.com/wavemaker/

Two mathematical waves, a thick blue line with a single pulse in the middle of it, and a thinner black line that's got dots along it and makes a far less symmetric shape. Text in lower right says Level 6.

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Andy Hall @testtubegames.com · 29/08/2026

Looking for science games/simulations/toys? Check out The Science Playground, a list of links I've pulled together from across the web. And if you have any favorites that aren't on the list, let me know! thescienceplayground.com

Andy Hall @testtubegames.com · 29/08/2026

No next mass level, ha, at least not yet. But I *did* unroll this whole mass hierarchy onto one long webpage: testtubegames.com/higgs101/?p=... Go browse the universe of the small!

Web site titled Mass Hierarchy.
Text: In order to celebrate the release of Agent Higgs 2, let's explore the universe of the very small!
Thumbnail of a card showing a Particle Physics Textbook next to a mass listed as 10^0 kg. Under that a card showing a Mobile phone next to a mass listed as 10^-1 kg.

Andy Hall @testtubegames.com · 29/08/2026

Aww... Shocktopus has a friend on Steam now 🥸 🐙

Screenshot from the steam site with two thumbnails underneath the heading: Recent Apps.
On the left is Agent Higgs 2's button, and on the right is The Electric Shocktopus's button - each button has the titular character on it, so they're side by side.

Oh my goodness -- my family is absolutely delightful. My spouse and kids made Higgs cookies... hid Higgs stickers around the house... printed me a movie poster... and got me the coolest swag hat that I've been wearing all day! ❤️ You're the best, @kslivensky.bsky.social!

Sugar cookie in the shape of an H with pink sprinkles on it.

Two bananas, one of which has a shiny Agent Higgs sticker on it.

Agent Higgs movie poster, printed off on foam board, and propped up on a stand in my kitchen. It has the characters on it, the title on top (Agent Higgs 2 Escape from the Standard Model) and the subtitle Time for Another Run.

A white hat with Agent Higgs on it, with the other particles and characters posed all around him.

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I mean, allllready feeling like it's going well.

Higgs icon next to text that says: 1+ Downloads

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Once you're trapped inside the Standard Model, there's no way out... until now. Agent Higgs 2 - my particle physics puzzle game is out today! Electrons, protons, photons, and more! The particles may be small, but big forces are at play. On PC/Mac/Linux/Android/iOS testtubegames.com/higgs2.html

Level in Agent Higgs 2, titled Electricity 8. Agent Higgs and a mysterious figure are both in a room with many crates. An electron and proton seem to be attracting with the help of a photon. The figure says: "The scientists caught you last time... but with my help you'll never get trapped again!"

Cartoon image of a collectible card - with a scared character at the top saying "What happened?!" The card title is Electric Repulsion and it has an image of two electrons repelling in the game. The text says: The electric force will make like electric charges repel. This force is stronger than the swiping force. Under that there's a stick figure character who is literally a stick who says: Sticky the Stickler Says... No distance dependence... and only cardinal directions?!

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Like, look at this code - I've never seen such complex math in Scratch! Love it!

Scratch code blocks, which are pretty cartoony, stacked in a list on top of each other. The block is titled: define update variables.

Under that are a bunch of lines of code that set various variables like initial radial velocity (I think) to match other combinations of variables. Lots of square roots and variable references, overall looks very complex.

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Andy Hall @testtubegames.com · 27/08/2026

In order to celebrate today's release of Agent Higgs 2... Let's explore the universe of the very small! We'll begin with an object of mass between 1-10 kg. Then go down by a factor of ten each post. And do that *32 times*! Let's start with something very familiar... a particle physics textbook.

Collectible card titled Particle Physics Textbook.
Image of a cartoon textbook titled The Standard Model and Me with a blue top-hatted character standing in front of the image on the cover.
Text: Contains at least 32 orders of magnitude of knowledge. Never leave home without it.
The mass is listed as 1.4 x 10^0 kg.
It's listed as being card 32 of 32, and Common.

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One more day until my game comes out, yikes! Agent Higgs never likes the limelight... sorry, buddy! testtubegames.com/higgs2.html

Game of Thrones meme of Winter is Coming, but instead it says Physics is Coming, with higgs hastily pasted over a guy with a sword's face.

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Andy Hall @testtubegames.com · 27/08/2026

The second step on our journey - a mobile phone. It lets you access an incredible amount of information right in the palm of your hand. Also... lets you access an incredible amount of disinformation right in the palm of your hand. So. Uh. Yeah, be careful out there!

Collectible card titled Mobile Phone.
Image of mobile phone with the title screen of a game called Agent Higgs 2.
Text: These marvels of technology give us access to educational games wherever we go.
The mass is listed as 1.7 x 10^-1 kg.
It's listed as being card 31 of 32, and Common.

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Andy Hall @testtubegames.com · 26/08/2026

Even lighter than that (by roughly a factor of ten) is a Manila folder, coming in at just 260 grams. Still in the realm of everyday objects... but not for long...

Collectible card titled Manila Folder.
Image of cartoon folder labeled Play and Confidential.
Text: These were originally made with Manila hemp fibers, from a plant named after the capital of the Philippines.
The mass is listed as 2.6 x 10^-2 kg.
It's listed as being card 30 of 32, and common.

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Andy Hall @testtubegames.com · 26/08/2026

The mass scales on our list will use scientific notation. And each step we go down by a factor of ten. Here, down at 4.6 x 10^-3 kilograms (4.6 grams) we'd find a Polaroid picture, which I'm assured they still produce.

Collectible card titled Polaroid Picture.
Image of polaroid picture showing a mysterious red H hiding behind a crate.
Text: Agent Higgs actually prefers to have these stirred, not shaken. He's not a very good photographer.
The mass is listed as 4.6 x 10^-3 kg.
It's listed as being card 29 of 32, and Uncommon.

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Andy Hall @testtubegames.com · 24/08/2026

Can my kitchen scale measure the mass of a single paperclip? No. Can it measure the mass of 274 paperclips? Yes. Did I do this all for you? Of course.

Collectible card titled Paperclip.
Image of cartoon paperclip holding a picture to a piece of paper in a folder. A mysterious part of a red h is visible.
Text: The second most versatile office supply, behind the mouse pad. In French these are "Trombones," but don't be fooled, they are used much differently.
The mass is listed as 2.9 x 10^-4 kg.
It's listed as being card 28 of 32, and Common.

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Andy Hall @testtubegames.com · 24/08/2026

Next stop on our journey of ever-smaller-masses, the humble googly eye. A word which I am certain is misspelled, but oddly, isn't.

Collectible card titled Googly Eye. Image of cartoon stick with googly eyes. Text: A small googly eye like you might put on a small stick. Not a large googly eye like you might put on a large stick. The mass is listed as 9.5 x 10^-5 kg. It's listed as being card 27 of 32, and Common.

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Andy Hall @testtubegames.com · 23/08/2026

Next stop on our journey of ever-smaller-masses, the humble googly eye. A word which I am certain is misspelled, but oddly, isn't.

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Andy Hall @testtubegames.com · 23/08/2026

Is this the smallest amount of water you can have? No, apparently that's 20 orders of magnitude smaller.

Collectible card titled One Cubic mm of Water.
Image of cartoon cube of water at the edge of a ruler.
Text: It would take about 50 of these cubes to get you a standard drop of water, though oddly I didn't use *that* for the next order of magnitude.
The mass is listed as 1.0 x 10^-6 kg.
It's listed as being card 26 of 32, and Common.

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Andy Hall @testtubegames.com · 22/08/2026

Here 7 days before Agent Higgs 2 comes out, we're at 10^-7 kg... At this scale, you'd find a tiny angiosperm, the tiniest in fact. Kinda like duckweed floating in water, but, obviously, ahem, smaller.

Collectible card titled Smallest Flowering Plant.
Image of cartoon oval-ish leaves floating in water.
Text: I'm referring to Wolffia globosa, of course. Super small water plant. And yes, it makes teeny tiny flowers.
The mass is listed as 1.5 x 10^-7 kg.
It's listed as being card 25 of 32, and Uncommon.

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Andy Hall @testtubegames.com · 20/08/2026

Here at the 8th step on our journey, we hit the Planck Mass. What do we find here? An object? An idea? Nothing at all? Surprised me how "normal" this mass actually is, though -- roughly the mass of an eyelash. More about the Planck units: en.wikipedia.org/wiki/Planck_...

Collectible card titled Planck Mass.
Image of a three circles labeled c, G, and h pointing at a mysterious question mark circle.
Text: This mass may point us to the secrets of the cosmos. It may be entirely meaningless. Or, just maybe, all of the above?
The mass is listed as 2.2 x 10^-8 kg.
It's listed as being card 24 of 32, and common.

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Andy Hall @testtubegames.com · 20/08/2026

Happy National Accessible Air Travel Day. Celebrate by launching children off swings high into the air. #ScienceHoliday testtubegames.com/swing.html

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Andy Hall @testtubegames.com · 19/08/2026

Finally, something at a mass scale we can easily see. Well, uh, not "see" exactly, but, ah, well. Hm. As we go up the orders of magnitude now, things are gonna get big fast...

Collectible card titled One Cubic mm of Air.
Image of the edge of a ruler with a translucent white cube on it.
Text: Look around you, and with any luck, you'll find a cubic millimeter of air. Hopefully, many.
The mass is listed as 1.2 x 10^-9 kg.
It's listed as being card 23 of 32, and common.

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Andy Hall @testtubegames.com · 18/08/2026

Pretty massive, at least as far as pollen goes. Note the lack of a tricolpate (three symmetric grooves on the side) shape - as you might see in something like birch pollen. That tells us corn is *not* a eudicot, and indeed is a monocot. Right, sorry, gotta get back to particle physics.

Collectible card titled Corn Pollen.
Image of a cartoon pollen grain, it's lumpy and unfortunately for me looks a bit like a corn kernel which it is not.
Text: This is one beefy pollen grain! When it lands on a strand of corn silk, it grows a pollen tube all the way down to fertilize one corn seed.
The mass is listed as 2.5 x 10^-10 kg.
It's listed as being card 22 of 32, and common.