Step 3: Creating a Room
Rooms are essentially your game's world. You add things to them, and those things show up on screen.
(Not) Creating Rooms
New GameMaker Studio projects come with a room pre-made, so let's use that! If you need to create one, they are done in the same way sprites are.

A free room? In this economy?

This is the Room Editor. Do not panic, it's super simple, I promise!
Resizing Rooms
Let's resize the room using the inspector panel on the left hand side. 1000x1000 should suffice for our use case.

You can resize in the Inspector Panel
Layers
Looking at the left panel again, near the top, you'll notice two layers that are created by default.
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"Background": This is a background layer and it's the background (duh). Usually a colour or an image.
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"Instances": This is an instance layer. This is where your object live.
Click on the "Instances" layer to select it, and then drag your player object into the room.

We've now placed an "instance" of our player object into the room
Let's do the same for the obj_shape we created, but a couple more times.

6 Shape objects in the room. pretty big huh?
Now if you run the game (by pressing F5, or by pressing the button at the top of the screen) the game will open, but nothing moves...
...So let's fix that!