Observed arrival · 2026-10-21
A sandbox where every grain has momentum
Tumblegrain is a browser falling-sand sandbox where materials react, move, and combine, with puzzles and a daily challenge.
○Open
⊠Login
$Paid
†Ads
✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- Fans of physics sandboxes and puzzle games
- Worth noticing
- Seven materials are loose on the page itself; puzzles include a sensor-triggered lamp and a dam-busting water release.
Field notes
The page organizes its material palette into ten families, including powders, liquids, living things, and logic parts. It describes mechanics such as heat transfer through copper, materials that copy or transform what they touch, and a rewind function for revising an experiment. The eight puzzles impose material limits; the page says each has been checked as winnable on desktop and phone screen sizes.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
One card from the complete issue