Open Source Sandbox Games

Luanti is a near-infinite-world block sandbox game and a game engine, inspired by InfiniMiner, Minecraft, and the like.

Create complex supply chains, produce materials, and defend against enemy waves in this cross-platform sandbox tower defense game.

Survive, farm, build, explore, play with friends, and do much more. Inspired by Minecraft, pushing beyond.

The Powder Toy is a desktop version of the classic 'falling sand' physics sandbox game, it simulates air pressure and velocity as well as heat!.

Terasology (started under the name Blockmania) is an open source project started by Benjamin “begla” Glatzel to research procedural terrain generation and efficient rendering techniques in Java using the LWJGL.

Infiniminer is a multiplayer block mining game with several different player classes to choose from.

A basic game for Luanti (formerly Minetest) developed by the Minetest team, often referred to as "Vanilla Minetest". It includes mods for basic tools, nodes, & an API for player visuals.

Explore other star systems. Earn money by trading, carrying passengers, or completing missions. Use your earnings to buy a better ship or to upgrade the weapons and engines on your current one. Blow up pirates. Take sides in a civil war.

Tired of the roblox tyranny and greed? The Novetus community game is the solution! Novetus was made to improve on RBXLegacy, with the addition of new features that enhance the launcher for mod development, player customization, and overall usability.

Sandboxels is an in-browser falling sand simulation game, with mechanics such as heat simulation, electricity, density, chemical reactions, fire, explosions, and over 500 unique elements to play with.

Original voxel game about emergent mechanics and exploration.

Principia is a physics-based sandbox building game. Build and play advanced contraptions, circuiting, minigames, robot adventures and more.

A Luanti (formerly Minetest) mod that adds advanced Dragons and powerful equipment.

Micropolis is a open city-building simulator game and is based on the original source code of SimCity , which was donated to the One Laptop per Child (OLPC) project by Electronic Arts as free and open source software under the terms of the...

The Fun-Focused Free Software Voxel World Game. Voxelands is a sandbox construction game based on Minetest.

An alternative to the Java web game "Minecraft Classic" that was listed on the official Minecraft site but taken down in 2016-2017.

Freeminer is an open source sandbox game inspired by Minecraft.

A mod for Luanti (formerly Minetest) that adds spiders, tree monsters, sand monsters, & other entities.

Darkflame Universe is a server emulator for LEGO Universe! Started in 2013, we sought to create the most accurate way to play LU again after it closed. Now, 6 years after the game closed, we have our second alpha test and will be releasing a closed beta in the near future.

Gnomescroll is a multiplayer survival RPG in surreal environments. Kill demons, raise puppies and collect rocks.

Golems Universal Constructor or Golems is a 3D recreational physics simulator.

Build robots, spaceships, clocks, catapults or cannons.

Add sensors, timers, switches, motors. Give it a brain. Make a mouse trap - or make a mouse.

Take the wheel and pilot your machine yourself.

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Cubyz is written in Zig, a rather small language with some cool features and a focus on readability.

RBXLegacy is a multi-version ROBLOX client based on RBXPri scripts that can play LAN and online servers. This also includes support for adding more clients, randomized body colors, and more! This includes the clients by themselves so you do not need to download them separately.

3d city builder game.

S&box is a platform and game development toolkit developed by Facepunch studio powered by Source 2. Initially, the development was based on Unreal Engine 4, but as soon as Half-Life: Alyx came out, Facepunch immediately requested the engine branch of the newly-published game.