Sokoban Level Generator (JavaScript)

A procedural level generator for Sokoban, written in JavaScript.

Install

npm i sokoban-generator

Demo

Play Sokoban created by this generator in action!

The website above uses the default options for the generator, except that it specifies the initial position of the player.

Usage

// es6
import {generateSokobanLevel} from sokoban-generator;
generateSokobanLevel();

// es5 or older
var sokobanGenerator = require("sokoban-generator");
sokobanGenerator.generateSokobanLevel();

The generator accepts an optional options, and can return either a string representation of the level, or a grid class.

If will return null if no solution is found. Increasing attempts might help.

const options = {
  width: 9, // the width of the sokoban grid 
  height: 9, // the height of the sokoban grid
  boxes: 3, // the boxes on the grid
  minWalls: 13, // the minimum number of walls on the grid
  attempts: 5000, // when generating the map, the maximum attempts
  seed: Date.now(), // map seed. See note below
  initialPosition: { // The initial position of player
    x: 0,
    y: 0
  },
  type: "string", // the return type, either "string" or "class" 
};

let level = generateSokobanLevel(options);

Note

• Seed is only expected to generate the same map under the same options. This means, for example,
  generateSokobanLevel({seed: 1, boxes: 2}) and generateSokobanLevel({seed: 1, boxes: 3}) will probably generate different levels.

Performance

The time it takes to generate a level is greatly increased when the number of size and walls are increased.

It took ~1 seconds to generate a result on default settings on a 2015 Ultrabook Laptop on Node, but it took only less than a second on runkit.

License

GNU GPLv3

Reference

The whole algorithm is partially based on this paper