Game - Minimal

This is a, as the name suggests, minimal template for you to get started, inside it's packaged with a basic plane and three boxes with physics enabled.

Addon

This is for those wanting to upload a map for a game, you can target the game you want to make a map for by clicking Project on the top left of the editor and going into Settings, from there you will see Target Game simply put in the indent of the game you wish to target, and it will prompt you to restart the editor after saving, once restarted, you will have access to the game's components, allowing you to make your own map for it.

This does require the author of the game to properly support custom maps, however, so do check before mapping!

Walker Map

This is for those wanting to wanting to map with the least resistance possible. The Walker Map template will automatically create a project that targets the Walker Game, letting you quickly build a map while instantly having access to a player controller.

However, this does mean the map will be exclusive to the Walker game, so if this is not your goal, do see the above Addon template