In this you can play test your game and get an idea

of what the gameplay will be like when it's built.

This can be paused and stepped forward at any time

in order to give you more accurate testing.

You can also tweak things whilst you are in play mode

in order to see what the game play is like with different settings.

The game view also allows you to set resolution

specific to the target platform that you're using.

For example my game view is set to Standalone

with a resolution of 1280 by 720.

If I choose to then maximise on play

the game view will restrict to exactly that resolution

so that I can see what it will look like.

To adjust this I go to Edit - Project Settings - Player

and this shows me the default

screen width and height under resolution.

If I edit this

I will see the change made immediately in the game view.

And if I choose to switch to a different target platform

I will get the resolution for that setting.

For example if I switch to Web Player

and return

Web Player is then featured

as the target platform I'm building for

and the preview mode for the game view.

In addition to Maximise On Play

the game view also has a Stats button

to allow you to see performance statistics

based on your game

and also the ability to show Gizmos in the same

way that the Scene view shows them already.

As you can adjust things whilst in play mode

you should also be aware

that any changes that you make will be undone

when returning to your project.

This is specific to changes that are

based on game objects in your scene

and not game objects that refgerence assets in the project.

For example if I was to change something relating to a material

that change is made to the original asset.

Whereas if I was to change something on a specific component

that change will be undone when play is pressed again.

It's also worth being aware

that when you press play, your game is running

and you can hint this by going to

Unity - Preferences on Mac

or Edit - Preferences on PC.

You can choose under Colours

a play mode tint,

I've chosen a shade of blue,

but I can make this any colour that I need to.

That way, when you press play

the rest of the interface will change to this colour.

This is to remind you that you are in

play mode and will lose changes

if you continue to work in that mode.