Is there any way to display a message to tell player to tilt screen?
Lets say you create your game in landscape dimensions, if a player (Mobile User) has their phone in a portrait position the game displays a message like (Please Tilt Screen) so it is in landscape display?
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You can force the game to play in landscape orientation in the Display properties. They will have no choice but to rotate their device if they want to play it.
You can use: touch - compare orientation