How to rotate game world in phaser3?

[monkeyWie]

If user's phone is portrait, the game rotate 90deg, and fill the screen (width < height). The user will rotate their phone.
If user's phone is landscape. the game show as normal.

Like this game:

[spayton]

Rotating the camera would be easiest, see: https://phaser.io/examples/v3/view/camera/rotate-camera

or add everything to a base container and rotate that, this might incur extra position correction.

You might have trouble with masking, they can operate in world space so won't move with camera/container.