The Building Game (18w44a) is an alpha file of the Minecraft map The Building Game, made for Minecraft 1.14-Snapshot. It was published on November 5, 2018 and is 3.8 MB in size. Pre-release builds can contain bugs — back up your world before installing. For the full description, screenshots and every other version, visit the The Building Game map page.
How to install: Extract the .zip and move the world folder into .minecraft/saves; the map then appears in your Singleplayer list.