Voxel Sandbox Block World Builder

Builds a complete first-person voxel sandbox game in one offline index.html: infinite seeded world with 5+ biomes, caves, ores, trees and water, chunk meshing with ambient occlusion, day/night cycle, AABB physics, flying and swimming, block breaking and placing, hotbar and inventory, Creative and Survival modes, Web Audio sounds, saved worlds and a cinematic autoplay trailer mode. Customise the game name, world height, an extra biome and the day length. Includes a full self-test checklist so the agent fixes bugs before handing over.