Why Procedural Generation Is a Game-Changer for Indie Devs

Building large, varied game worlds is one of the biggest challenges for small teams. Procedural level design — using algorithms to generate content automatically — lets a solo developer or small studio create experiences that feel expansive without hand-crafting every room, enemy encounter, or terrain feature. Games like Spelunky, Dead Cells, and No Man's Sky have shown just how powerful this approach can be.

This guide covers the core techniques and when to apply each one.

1. Tile-Based Room Generation

The most approachable starting point for 2D games. You define a set of room templates (tiles) and write rules about how they connect — which exits align, which rooms can follow which. At runtime, the algorithm assembles them into a dungeon or level.

Best for: Roguelikes, dungeon crawlers, metroidvanias.

Key consideration: Always guarantee solvability — ensure the player can reach all required areas before placing the exit.

2. BSP (Binary Space Partitioning)

BSP recursively divides a rectangular space into smaller rectangles, then converts those rectangles into rooms connected by corridors. It's a classic approach with predictable results.

  • Split a large rectangle into two halves (randomly or by rules).
  • Recursively split until rooms reach a minimum size.
  • Place a room inside each leaf partition.
  • Connect adjacent rooms with corridors.

Best for: Top-down dungeon games, traditional roguelikes.

3. Wave Function Collapse (WFC)

WFC is a constraint-based algorithm inspired by quantum mechanics. You give it a tileset and rules about which tiles can appear next to each other. It then "collapses" the level map tile by tile, always respecting those adjacency rules, creating coherent patterns that look hand-designed.

WFC produces results that feel far more organic and visually consistent than simple random placement. It's become popular for tile-based overworld maps, city generators, and dungeon decoration.

Best for: Tile maps that need to look visually cohesive, overworld generation.

4. Noise-Based Terrain Generation

For top-down or side-scrolling worlds with organic terrain, noise functions are fundamental. Perlin noise and simplex noise generate smooth, random-looking height maps that translate into convincing landscapes.

  • Sample a 2D noise function at each grid position to get a height value.
  • Apply thresholds: height below 0.3 = water, 0.3–0.6 = ground, above 0.6 = mountains.
  • Layer multiple noise octaves (different scales) for more natural-looking results.

Best for: Open-world games, exploration games, Minecraft-style voxel worlds.

5. Grammar-Based Generation

L-Systems and shape grammars use rule sets (like a formal grammar) to expand a simple starting symbol into complex structures. The original L-System was invented to model plant growth, but game developers have used it to generate convincing dungeons, cities, and road networks.

Best for: Procedural cities, organic structures, narrative-driven level generation.

Mixing Techniques: The Real Power

The best procedural systems combine techniques. A common pattern:

  1. Use noise to generate a macro terrain map.
  2. Use BSP or WFC to generate indoor areas within that terrain.
  3. Use room templates to ensure key gameplay encounters are hand-crafted even in a procedural layout.

This "controlled randomness" approach gives you the variety of procedural generation without sacrificing level design quality.

The Golden Rule: Guarantee Fun, Not Just Variety

Procedural generation doesn't replace level design thinking — it automates parts of it. You still need to think about pacing, challenge curves, and player guidance. Build rules that encode good design principles, and your generator will reliably produce levels worth playing.