Simple Block Physics
by Ferrin-Ember
When a block loses its support, Simple Block Physics makes the blocks above it collapse as well, turning them into falling entities that can scatter across the ground.
What it does
Simple Block Physics checks whether blocks still have support after a break and, when they do not, applies a recursive collapse. Broken blocks become falling block entities, similar to sand, that tumble until they settle on a suitable spot. Drops can be configured, and the chance that a dropped block breaks on landing can be adjusted too. Collapse logic runs only where updates are needed, which keeps the overhead of the physics small.
The mod is built around cave-ins and sky bases: a player who hollows out a mountain or builds high above the ground has to deal with what happens when the support is removed. Builds are not protected by default, so the mod works as a risk that players accept when they make structures without solid foundations. Its config offers many options for tuning how strict the collapses are, and the mod pairs well with Improved Mobs, which adds mob block-breaking behavior.
Simple Block Physics is licensed under the MIT License and is open source, with source code and an issue tracker published. It is published for Forge and NeoForge, with files for 1.20.1 and 1.21.1, and it runs on client and server, so the server and every player need it.
Key features
Recursive block collapse
Removing a block can cause the unsupported blocks above it to fall, with the collapse continuing through the structure.
Falling block entities
Broken blocks become falling entities, similar to sand, that scatter across the ground before coming to rest.
Configurable drops and breakage
Server owners can set which blocks drop items and how likely a dropped block is to break when it lands.
Need-based physics updates
Physics checks run only when a block change requires them, so the mod does not recalculate every block in the world.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
How it compares
Block Physics Overhaul is a Forge mod for 1.16.5 with a different version range and no open source license. MineCollapse covers 1.20.1 – 1.21.1 on Forge and NeoForge under a custom license, and it is not open source. Sand Physics is NeoForge only for 1.21.1 and is open source under the MIT License, so it covers a single version where this mod covers two.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Simple Block Physics | Forge and NeoForge | 1.20.1 – 1.21.1 | Client and server | 2025-09-27 |
| Block Physics Overhaul | Forge | 1.16.5 | Client and server | 2023-11-13 |
| MineCollapse | Forge and NeoForge | 1.20.1 – 1.21.1 | Client and server | 2025-07-14 |
| Sand Physics | NeoForge | 1.21.1 | Client and server | 2026-07-15 |
Questions
Does Simple Block Physics need to be installed on the server?
Which loaders does Simple Block Physics support?
Can the collapse behavior be changed?
In the catalog
Simple Block Physics is one of 19,031 Adventure mods on ModsFinder, and one of 10,478 Adventure mods for Forge. 32,366 mods support Minecraft 1.21.1.
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What the author says
!WARNING! Add to your world at your own risk, as it can (obviously) destroy builds! Broken blocks are turned into falling block entities (like sand, configurable) which then drop, possibly break, and scatter on the ground, continuing to tumble until a suitable spot is found. Just make sure you aren't in the way when…
Official listing
- Modrinth page
- modrinth.com/mod/simple-block-physics
- Owner
- Ferrin-Ember
- Published
- 2024-08-27
- Updated on Modrinth
- 2025-09-27
- Facts verified
- 2026-10-15