Packages providing 'walls'

• Voxelgarden
  Casimir

  A game for exploring, progress and building

• Minetest Game
  Minetest

  A game which is bundled by default with Minetest, and aims to be lightweight, moddable, and fairly playable without mods.

• Aftermath
  maikerumine

  Apocolyptic survival game.

• Legends of Minetest
  D00Med

  A game based on several games from the Legend of Zelda series