What Other Interactive Demos Are on Grant Kot's Website?

Beyond Liquid Layers, grantkot.com hosts several browser-based demos you can open and try directly: Tutti Space Program (a WebAssembly/WebGL space simulator), Pencil Physics (draw-and-simulate shapes), VoxelMash (a shared multiplayer voxel sandbox), and a Synthesizer (multi-layered Web Audio instrument). The same page also links to smaller experiments — 2D physics toys, a Tokyo 3D point cloud viewer, early 3D fluid tests, and a Million Checkboxes remake. All are playable in a browser; the site marks several as mobile-friendly, and none of the listed demos show pricing or login requirements.

The four main demos

Tutti Space Program

This is the demo to try if you want to see how far browser technology can be stretched. The site describes it as pushing the limits of WebAssembly (multithreading and SIMD) and WebGL. Expect a heavier load than the 2D toys — a reasonably capable desktop browser is the safer bet, though the site doesn't publish hardware requirements.

Pencil Physics

The most approachable of the four. You draw a shape, and the demo simulates it. Because it supports multi-touch and pen input, it works well on a phone or tablet — draw with a finger or stylus and watch the physics respond. This is a good first stop if you're mainly curious about the interaction style behind Liquid Layers.

VoxelMash

A voxel sandbox where the world is shared: the site says it is synchronized with all visitors, so what you see is a communal build space rather than a private one. A new version is in development, so treat the current build as a work in progress.

Synthesizer

A Web Audio instrument with multiple layers and "highly customizable sounds." It's mobile-friendly, so you can tweak sounds on a phone or tablet. No account or download is mentioned — you just open and play.

Smaller experiments on the same page

• 2D physics experiments — bouncing blobs with soft-body physics, polygon interactions, and sine wave patterns (listed as Poly!, Blobs, and Sine).
• Tokyo 3D — a 3D point cloud viewer of Tokyo with two modes, Points and Points + Mesh. The site warns that memory requirements are high, especially for Points + Mesh, so use a machine with plenty of RAM.
• Liquid 3D — very early-stage 3D fluid tests (MPM and SPH). The author notes performance isn't the best yet.
• Million Checkboxes — a multiplayer remake of One Million Checkboxes, originally created by Nolen Royalty.

What's coming

The site mentions a Liquid Layers Maker (coming soon): Liquid Layers will be combined with the author's other physics systems — line physics, blobs, and smoke — into a combined 2D sandbox, with a separate site planned for sharing creations. Separately, the author describes Liquid Crystal, an earlier 3D voxel project, and says demos are available for download on the itch.io page kotsoft.itch.io for those with a powerful computer.

How to choose

• Want a quick phone-friendly toy: Pencil Physics or the Synthesizer.
• Want to see browser tech pushed hard: Tutti Space Program.
• Want to build alongside other visitors: VoxelMash.
• Want to explore a real city in 3D: Tokyo 3D — but check your available memory first.

Each demo is launched from its own "Play" link on the grantkot.com homepage, and the page also points to the author's updates on X (@kotsoft and @GrantKot) if you want to follow new releases.