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1

Add TileMap

In your game scene, add a 'TileMap' as a child of your game node.

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2

Create TileSet

In the inspector window, create a new tileset.

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3

Import Tileset

At the bottom of the screen, click 'TileSet'. If you're using the demo assets, drag in 'world_tileset.png' to this screen. Click 'yes' when It asks if you want to automatically create tiles in the atlas.

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4

Paint Environment

Using the paint tool in the TimeMap window, select a tile and start to paint in your environment to the game scene. Get Creative!

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5 5

Add Physics Layer

In the inspector, add a new physics layer to the tilemap. Back in the TileSet window, click the 'paint' tab and paint the new physics layer onto each tile you want to have collision. (That is, each tile you want the player not to fall through.)