How to Make an App Like Minecraft

Building a Minecraft-like game is one of the more technically demanding things you can attempt in games engineering. Voxel worlds, procedural generation, real-time multiplayer, and modding support all in one product. This post covers what that stack actually looks like, where the hard problems sit, and what you should think about before committing to the build.

What Kind of Game Are You Actually Building?

"Like Minecraft" covers a lot of ground. There is a spectrum here:

• A pure sandbox voxel world (creative mode focus)
• A survival game with crafting and progression
• A multiplayer server platform with user-generated content
• An educational or enterprise simulation built on voxel tech

Each of these has a different architecture. A creative sandbox is relatively forgiving on server infrastructure. A survival multiplayer game with thousands of concurrent users is a distributed systems problem as much as a games problem. Decide which one you are building before you write a line of engine code.

How Do You Build a Voxel Engine?

This is the core technical challenge. Minecraft's world is a 3D grid of blocks, each with a type and optional metadata. The naive implementation, storing every block as an individual object, does not scale. A single chunk in Minecraft is 16 × 16 × 256 blocks, which is 65,536 blocks. A loaded world keeps dozens of chunks in memory at once.

Chunk-Based Storage

Divide the world into fixed-size chunks. Each chunk stores its blocks in a flat array indexed by local coordinates. Use run-length encoding or palette compression to handle the fact that most chunks are mostly air. Minecraft's own format has gone through several iterations, landing on a palette-based approach per chunk section (16 × 16 × 16 sub-chunks) as of the Anvil format.

In practice, you want something like:

• A ChunkManager that handles load, unload, and serialisation
• A spatial hash or region file system for on-disk storage
• A dirty-flag system so only modified chunks get written back to disk

Mesh Generation and Greedy Meshing

Rendering every block face individually is GPU suicide. You need to batch geometry per chunk. The standard technique is greedy meshing: merge adjacent faces of the same block type into a single quad. This can reduce face count by 80–90% in typical terrain. Libraries like Transvoxel help if you want smooth terrain too.

For the rendering pipeline, Vulkan gives you the most control and is worth the setup cost if you expect large worlds or modded content. Unity's DOTS/ECS stack with the Burst compiler is a reasonable middle path if you want faster iteration. Unreal Engine 5 has Nanite, but Nanite is designed for high-poly static meshes, not dynamic voxel geometry, so it does not help you here.

Procedural World Generation

Perlin noise and its successor, simplex noise, are the baseline. Minecraft uses a combination of 3D density noise (for cave and overhang generation) and 2D height noise, blended with biome weighting. The key parameters are octaves, persistence, and lacunarity. Getting interesting terrain means layering four to eight octaves and tuning the blend.

For biomes, you need a second noise layer (or a Voronoi diagram) to determine climate zones, then map those zones to terrain presets. The hard part is making biome boundaries look natural rather than abrupt. Minecraft uses a "double smoothing" approach at biome edges.

Ore and structure placement uses a separate seeded random pass over each chunk. Structures that span chunk boundaries (dungeons, villages) require a two-pass system: a planning pass that reserves space across chunk boundaries, and a placement pass that executes once all relevant chunks are loaded.

How Do You Handle Multiplayer at Scale?

Single-server Minecraft hosts work up to a few hundred players on decent hardware. Beyond that, you need a different model.

The standard approach for large-scale voxel multiplayer:

Approach	Max concurrent players	Complexity	Latency
Monolithic Java server	~200–500	Low	Low
BungeeCord / Velocity proxy	1,000–5,000	Medium	Low
Custom distributed shard	10,000+	High	Medium

A sharded architecture splits the world into spatial zones, each handled by a separate process. Players moving between zones trigger a handoff. The hard problems are entity continuity at zone boundaries and global state (economy, player inventory) that every shard needs to read. That global state typically lives in Redis for hot data and PostgreSQL for durable storage.

For the network protocol, most custom implementations use UDP with application-layer reliability (similar to QUIC) rather than raw TCP. TCP's head-of-line blocking is painful for real-time positional updates. You retransmit critical packets (block changes, inventory updates) and drop stale ones (position snapshots older than 100ms).

Physics, Entities, and Game Logic

Voxel physics is simpler than rigid-body physics because most objects are axis-aligned. AABB (axis-aligned bounding box) collision against the voxel grid covers player movement, projectiles, and falling blocks. For entities that need more complex behaviour (mobs with pathfinding), you run a separate physics budget per entity.

Pathfinding in a dynamic voxel world is genuinely hard. A* over the voxel grid is too slow for large open spaces. The practical solution is a two-level system: a high-level navmesh or waypoint graph that updates asynchronously when blocks change, and a low-level AABB-based steering layer for fine movement. Recast/Detour is the standard navmesh library and has been adapted for voxel worlds.

Game logic (crafting, inventory, progression) lives in a server-authoritative system. Never trust the client for anything that affects world state. Validate every action server-side, even if it costs a round trip.

Modding Support and Content Pipelines

Minecraft's longevity is largely attributable to its modding ecosystem. If you want that, you need to design for it from the start. Retrofitting modding support is painful.

The minimum viable modding API covers:

• Block and item registration with a unique namespace
• Event hooks for world generation, entity spawning, and crafting
• A resource pack system for textures and sounds
• Sandboxed scripting, typically Lua or a subset of JavaScript

If you want a richer modding environment, look at how Fabric (the modern Minecraft modding framework) exposes mixins for bytecode injection. That is a powerful pattern but it means your internal APIs become public contracts you can't break without breaking mods.

Content pipelines for a commercial game need an asset processing step: compress textures to BC7 or ASTC depending on target platform, generate mipmaps, and pack small assets into atlases to reduce draw calls.

Conclusion

Building a Minecraft-like game is achievable, but scope is the main risk. The voxel engine, procedural generation, multiplayer infrastructure, and modding system are each multi-month engineering efforts. Most teams underestimate the multiplayer work by a factor of two or three.

Start with a vertical slice: a single-player world with one biome, basic crafting, and a save/load system. Get that working well before adding multiplayer or mod support. The architecture decisions you make in that slice (chunk format, coordinate system, block registry) are expensive to change later.

If you want a technical review of your architecture or a team to accelerate a specific layer of the stack, get in touch with Sodio.

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FAQ

How long does it take to build a Minecraft-like game? A small team of three to five engineers building a basic single-player voxel game with procedural generation, crafting, and save/load can expect 12 to 18 months to reach a shippable alpha. Adding real-time multiplayer for hundreds of concurrent players adds another 6 to 12 months of infrastructure and testing work.

What engine should I use to build a voxel game? Unity with DOTS/ECS and the Burst compiler is the most practical choice for most teams. It gives reasonable performance without the full overhead of writing a custom engine. Godot 4 has improved voxel support and is a viable free alternative. Custom engines make sense only if you have specific performance requirements that off-the-shelf engines cannot meet.

How does Minecraft handle such large worlds without running out of memory? Minecraft uses a chunk-based streaming system. Only chunks within a configurable render and simulation distance are kept in memory. Chunks outside that radius are serialised to disk (in region files, 32 × 32 chunks per file) and unloaded. A typical server keeps 400 to 900 chunks active per player, not the entire world.

What programming language should I use? C++ or C# (via Unity) are the standard choices. Java was Minecraft's original language; it works but imposes GC pauses that hurt real-time performance at scale. If you are writing a custom engine, C++ with a data-oriented design gives the most headroom. Rust is a credible alternative with better memory safety guarantees, but the ecosystem for game tooling is still maturing.

Is it worth building a custom voxel engine or using an existing library? For most projects, use an existing library or engine. Writing a voxel engine from scratch takes six to twelve months before you have anything game-ready. Libraries like Voxelman (Unity), Godot-Voxel, or TerraForge cover the core meshing and storage work. A custom engine is only justified if your game has requirements those libraries cannot meet, such as a planet-scale world or real-time destructible terrain at very high resolution.

Have a project in mind? Contact Sodio Technologies to discuss your requirements and explore the right technology solution for your business.