Andy Hall's Avatar

Andy Hall

@testtubegames.com

Game Developer behind TestTubeGames. Enjoy building, finding, and sharing cool science through games / toys / simulations. My games: https://testtubegames.com Other games I love: https://thescienceplayground.com/ he/him

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03.08.2023
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Latest posts by Andy Hall @testtubegames.com

Ah good, I'll give it a check on Android.

There's a lot of pretty funky gpu/texture magic going on under the hood, so an issue like that could make sense. If I had to guess, I imagine you won't see it on the desktop.

Thanks for the heads up!

26.02.2026 16:04 πŸ‘ 2 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

Oooh, yay, a bug! (Nope, that shouldn't be happening.)

I'm assuming that happens right when you load it up? Curious what browser you're using, too.

26.02.2026 15:59 πŸ‘ 0 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

Check this shit out:

26.02.2026 00:01 πŸ‘ 62 πŸ” 18 πŸ’¬ 6 πŸ“Œ 4
3 by 3 grid representing a minigolf course with a cartoon flag in the lower left, and a golf club to the right. Four tiles have little dotted-circles in them representing magnetic fields, and there is a red ball with a curved path shown behind it. The ball has gone around the golf course, curving 90 degrees every time it passes through one of the magnetic fields.

3 by 3 grid representing a minigolf course with a cartoon flag in the lower left, and a golf club to the right. Four tiles have little dotted-circles in them representing magnetic fields, and there is a red ball with a curved path shown behind it. The ball has gone around the golf course, curving 90 degrees every time it passes through one of the magnetic fields.

New game posted at Universe & More! What?!

Magnetism Mini Golf. Go give it a play - perfect for some magnetic puzzle fun, and GREAT fore students.

universeandmore.com/magnetism-mi...

25.02.2026 18:00 πŸ‘ 16 πŸ” 5 πŸ’¬ 1 πŸ“Œ 3
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Which is harder to simulate - Dark Matter or Gas?

Find out in my latest blog post, which includes pretty animations and also a sneak peek at a sim you can run yourself?!

testtubegames.com/blog/dark-ma...

25.02.2026 17:54 πŸ‘ 8 πŸ” 3 πŸ’¬ 2 πŸ“Œ 0

Always rough when games disappear - looks like it was a cool one!

25.02.2026 21:07 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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Realized I should give y'all something to check out if I say this. Check this shit out

25.02.2026 14:13 πŸ‘ 30 πŸ” 9 πŸ’¬ 6 πŸ“Œ 3
3 by 3 grid representing a minigolf course with a cartoon flag in the lower left, and a golf club to the right. Four tiles have little dotted-circles in them representing magnetic fields, and there is a red ball with a curved path shown behind it. The ball has gone around the golf course, curving 90 degrees every time it passes through one of the magnetic fields.

3 by 3 grid representing a minigolf course with a cartoon flag in the lower left, and a golf club to the right. Four tiles have little dotted-circles in them representing magnetic fields, and there is a red ball with a curved path shown behind it. The ball has gone around the golf course, curving 90 degrees every time it passes through one of the magnetic fields.

New game posted at Universe & More! What?!

Magnetism Mini Golf. Go give it a play - perfect for some magnetic puzzle fun, and GREAT fore students.

universeandmore.com/magnetism-mi...

25.02.2026 18:00 πŸ‘ 16 πŸ” 5 πŸ’¬ 1 πŸ“Œ 3
Video thumbnail

Which is harder to simulate - Dark Matter or Gas?

Find out in my latest blog post, which includes pretty animations and also a sneak peek at a sim you can run yourself?!

testtubegames.com/blog/dark-ma...

25.02.2026 17:54 πŸ‘ 8 πŸ” 3 πŸ’¬ 2 πŸ“Œ 0
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Finishing up the latest TestTubeGames newsletter, which should go out tomorrow.

All about Dark Matter and Gas... and pretty simulations like this...

Last chance to sign up: mailchi.mp/d92658cb25c4...

13.02.2026 03:47 πŸ‘ 4 πŸ” 2 πŸ’¬ 0 πŸ“Œ 0
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Finishing up the latest TestTubeGames newsletter, which should go out tomorrow.

All about Dark Matter and Gas... and pretty simulations like this...

Last chance to sign up: mailchi.mp/d92658cb25c4...

13.02.2026 03:47 πŸ‘ 4 πŸ” 2 πŸ’¬ 0 πŸ“Œ 0
Preview
gradient.horse Draw a horse, watch it run!

omg everybody go draw a horse this is what the internet was made for

gradient.horse

09.02.2026 23:11 πŸ‘ 7008 πŸ” 3607 πŸ’¬ 35 πŸ“Œ 154

imagine if all that money had gone to teachers instead

25.01.2026 14:37 πŸ‘ 1560 πŸ” 616 πŸ’¬ 15 πŸ“Œ 30
An annotated map of the solar system with hundreds of solar elements in beautiful rings

An annotated map of the solar system with hundreds of solar elements in beautiful rings

Beautiful graphic of the day (because that should be a thing: Our Solar System

By my data hero Eleanor Lutz

16.01.2026 02:12 πŸ‘ 500 πŸ” 137 πŸ’¬ 4 πŸ“Œ 9
TestTubeGames logo, a test tube filled with purple liquid over a pink circle.
Title: Welcome Back!
I've got a new project to share today - all about the Cosmic Microwave Background. This is ancient light that's been traveling for billions of years to reach us today.

TestTubeGames logo, a test tube filled with purple liquid over a pink circle. Title: Welcome Back! I've got a new project to share today - all about the Cosmic Microwave Background. This is ancient light that's been traveling for billions of years to reach us today.

Last chance* to join the TestTubeGames newsletter!

Project updates, deep dives into the science behind my games, and links to other cool science to explore online.

Delivered right to you, and not surrounded by a feed of current events.

mailchi.mp/d92658cb25c4...

*what?

14.01.2026 16:44 πŸ‘ 7 πŸ” 3 πŸ’¬ 0 πŸ“Œ 0
TestTubeGames logo, a test tube filled with purple liquid over a pink circle.
Title: Welcome Back!
I've got a new project to share today - all about the Cosmic Microwave Background. This is ancient light that's been traveling for billions of years to reach us today.

TestTubeGames logo, a test tube filled with purple liquid over a pink circle. Title: Welcome Back! I've got a new project to share today - all about the Cosmic Microwave Background. This is ancient light that's been traveling for billions of years to reach us today.

Last chance* to join the TestTubeGames newsletter!

Project updates, deep dives into the science behind my games, and links to other cool science to explore online.

Delivered right to you, and not surrounded by a feed of current events.

mailchi.mp/d92658cb25c4...

*what?

14.01.2026 16:44 πŸ‘ 7 πŸ” 3 πŸ’¬ 0 πŸ“Œ 0
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Someone fund me to make this into a travel show where we spin the wheel and then go see the bird wherever in the world it might be.

It'll have Fishing With John vibes but will also be very educational.

I can give you my Venmo.

13.01.2026 20:25 πŸ‘ 10 πŸ” 1 πŸ’¬ 3 πŸ“Œ 0

It turns out that you can create an interference pattern using light from two independent lasers. The interference arises from the quantum view that you cannot tell which laser any individual photon came from.

09.01.2026 23:04 πŸ‘ 48 πŸ” 3 πŸ’¬ 9 πŸ“Œ 0

…!
That’s amazing.

09.01.2026 23:06 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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The Mentos challenge just got serious 🧐 See what happens when chem prof Tom Kuntzleman dds Mentos to a bottle of champagne in comparison to a different carbonated beverage. Cheers! #wsuchemistry #ChemSky #mentoschallenge #ChemEd

06.01.2026 20:34 πŸ‘ 20 πŸ” 7 πŸ’¬ 2 πŸ“Œ 3
Image of an Alaskan bog with water and red moss in the foreground and trees in the background.

Image of an Alaskan bog with water and red moss in the foreground and trees in the background.

Let’s make 2026 the year of the bog. The world’s most unique and interesting plants, clean water, cooler climate. Bogs deserve our thanks, care, and deep respect. Please join me and love a bog today.

05.01.2026 22:15 πŸ‘ 955 πŸ” 252 πŸ’¬ 33 πŸ“Œ 35
Preview
Vault Learning Games Library Vault is the most comprehensive library of free learning games for grade 3+ created by education researchers at Field Day Lab (University of Wisconsin - Madison)

Intrigued by this new collection of learning games. You all know I love a good list...
"Vault Game Library"
vaultlearninggames.org

19.12.2025 17:45 πŸ‘ 2 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
Discord server message, small cartoon character icon, message written by andy.  "That's that, then. If there are any folks that are against using AI and in the creator space, feel free to track me down elsewhere. You're not alone, and I'd love to support your stuff."

Discord server message, small cartoon character icon, message written by andy. "That's that, then. If there are any folks that are against using AI and in the creator space, feel free to track me down elsewhere. You're not alone, and I'd love to support your stuff."

When you look around a creatives discord server and realize folks have only been sharing AI-related creations for months...

Hope somebody who needs this message finds it.

17.12.2025 15:23 πŸ‘ 6 πŸ” 2 πŸ’¬ 1 πŸ“Œ 0
Header: No AI
Worth writing it in its own category here. In general, AI is a vehicle for evil and misinformation. So I think it should be kept as far away from education as possible. As an added bonus, AI harms creators – and sharing creations and supporting creators is the whole reason this site exists. So. No thank you.

Header: No AI Worth writing it in its own category here. In general, AI is a vehicle for evil and misinformation. So I think it should be kept as far away from education as possible. As an added bonus, AI harms creators – and sharing creations and supporting creators is the whole reason this site exists. So. No thank you.

Time for an addendum to The Science Playground's "About" page. I think this just about covers it.

17.12.2025 16:43 πŸ‘ 7 πŸ” 3 πŸ’¬ 0 πŸ“Œ 0

ngl, I'm nervous about the future of these types of projects. Historically science projects on the web are cool and unique passion projects - even the most half-baked ones are a delightful reflection of the creators.

Though I guess generic vacuous projects are *also* a reflection.

17.12.2025 15:28 πŸ‘ 4 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
The Science Playground – a list of interesting links

For cool projects I've found made by humans: thescienceplayground.com

17.12.2025 15:25 πŸ‘ 6 πŸ” 4 πŸ’¬ 1 πŸ“Œ 1
Discord server message, small cartoon character icon, message written by andy.  "That's that, then. If there are any folks that are against using AI and in the creator space, feel free to track me down elsewhere. You're not alone, and I'd love to support your stuff."

Discord server message, small cartoon character icon, message written by andy. "That's that, then. If there are any folks that are against using AI and in the creator space, feel free to track me down elsewhere. You're not alone, and I'd love to support your stuff."

When you look around a creatives discord server and realize folks have only been sharing AI-related creations for months...

Hope somebody who needs this message finds it.

17.12.2025 15:23 πŸ‘ 6 πŸ” 2 πŸ’¬ 1 πŸ“Œ 0
Preview
a surgeon washes his hands in front of a sign that says netflix Alt: a surgeon washes his hands in front of a sign that says netflix
14.12.2025 19:11 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Writers and illustrators tend to be against AI, but where I haaave seen it crop up or be admitted to in the Kidlit arena is in creating additional resources, like activities and discussion guides.

Please be assured, *nothing* I create is done with AI. Including bonus resources like these.
❀️⬇️
#NoAI

11.12.2025 18:19 πŸ‘ 10 πŸ” 3 πŸ’¬ 0 πŸ“Œ 0
Publishers Marketplace Deal Report, December 9, 2025. 
I'M A STAR By Katie Slivensky, Steph Stilwell
Imprint: Beach Lane Books
Katie Slivensky's I'M A STAR, an astronomy tale with humor, heart, and plenty of stellar facts, told from the viewpoint of one of our galaxy's newest and most enthusiastic stars, illustrated by Steph Stilwell, to Andrea Welch at Beach Lane Books, in an exclusive submission, for publication in spring 2028, by Ammi-Joan Paquette at Aevitas Creative Management for the author, and by Aliza Hoover at The CAT Agency for the illustrator (world).

Framed by an adorable graphic of outer space characters, various planets and one big smiling star, illustrated by Steph Stilwell.

Publishers Marketplace Deal Report, December 9, 2025. I'M A STAR By Katie Slivensky, Steph Stilwell Imprint: Beach Lane Books Katie Slivensky's I'M A STAR, an astronomy tale with humor, heart, and plenty of stellar facts, told from the viewpoint of one of our galaxy's newest and most enthusiastic stars, illustrated by Steph Stilwell, to Andrea Welch at Beach Lane Books, in an exclusive submission, for publication in spring 2028, by Ammi-Joan Paquette at Aevitas Creative Management for the author, and by Aliza Hoover at The CAT Agency for the illustrator (world). Framed by an adorable graphic of outer space characters, various planets and one big smiling star, illustrated by Steph Stilwell.

Hey there, I, ROCK: A Geology Tale fans. 😁πŸͺ¨

Guess who's teaming up again??? This time, we aren't Earthbound... Steph Stilwell and I are back at it, taking on ASTRONOMY!!! πŸ˜ƒβ­πŸŒŒπŸ”­

I am so beyond excited to announce this new #BookDeal!!!!

Ahhhh!!!! πŸ˜ƒπŸ˜ƒπŸ€©

#KidLit
#STEMLit
#PictureBooks

11.12.2025 14:24 πŸ‘ 50 πŸ” 13 πŸ’¬ 7 πŸ“Œ 3