Free · runs in your browser

Oddly satisfying physics videos, made in your browser

Pick a template, change a few settings and download an MP4 for TikTok, Reels, Shorts or YouTube. Nothing to install, no account needed.

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  • 30s video ready in about 10s
  • Vertical and wide formats
  • Same seed, same video
  • No signup

Templates

01

Ring Escape

One ball inside dozens of spinning rings. Every gap it finds breaks a ring. Can it escape before time runs out?

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02

Ball Duel

Two balls with spinning swords fight in a circular arena. Every hit makes the sword longer. The fight goes on until one ball is knocked out.

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03

Last One Standing

Flags or names bounce inside a spinning ring. Fall through the gap and you are out. The last ball inside wins.

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04

Rotating Ring

Balls bounce inside a spinning ring. Each one that escapes through the gap turns into two, until the ring is full.

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05

Arena Battle (RED vs BLUE)

RED and BLUE paint the 100-slice arena. The first team to own the target share (60% by default) wins.

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06

Growing Ball

One ball in a circle grows a little with every bounce, and every bounce plays the next note. How many bounces until it fills the circle?

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07

Plinko

Balls fall through a board of pegs while the score adds up. The video ends the moment a ball lands in a rare ×10 edge slot.

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08

Brick Break

Two balls demolish a rainbow brick wall. The video ends the moment the last brick breaks.

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09

Music Stairs

A ball hops down a zigzag staircase, and each step plays the next note of the melody until the song is over.

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10

Marble Race

Four marbles race down a random course of tilted bars, gaps and bumpers.

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11

Pixel Conquest

Two teams paint a pixel map cell by cell while the percentage updates live. The first team to paint the target share (60% by default) wins.

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12

Gravity Well

Balls orbit gravity wells while the safe zone shrinks. The last ball in orbit wins.

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Frequently asked questions

How do I make bouncing ball simulation videos?

Pick a template like Rotating Ring or Plinko. HypnoSim runs the simulation right away with a random seed. Change gravity, bounciness or the template settings if you want, then download the MP4. A 30 second video takes about 10 seconds.

Is HypnoSim free?

Yes. Every template, format and sound feature is free with no signup. Exports carry a small hypnosim.com watermark.

Which formats can I export?

Vertical 9:16 (1080×1920) for TikTok, Reels and Shorts, wide 16:9 (1920×1080) for YouTube and square 1:1 (1080×1080) for Instagram. All exports are 60 fps H.264 MP4 with AAC audio.

How does the sound work?

Each collision plays a note at the exact moment it happens. On Music Stairs the balls play a melody step by step, and in Arena Battle each team has its own pitch. You can also upload your own MIDI file as the melody.

What makes these videos satisfying to watch?

The sound matches every bounce, and each template has something to follow: a ball count that keeps growing, a score race to 100%, marbles racing laps or balls dropping into a ×10 slot.

Can I recreate the exact same video again?

Yes. The same seed and settings always give the same video, in every format. Note the seed of a run you like and you can render it again later.

Do I need to install anything?

No. Everything runs in your browser, including the physics, sound and MP4 encoding. Chrome or Edge gives the fastest exports.