Players do not install anything. They scan your QR code or open giggame.app/play in their phone's browser and type the access code.
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The player enters the access code.
They are asked for a player name.
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The player chooses a name.
If you asked for more information, such as a phone number or email, they are asked for it now. See the sign-in fields.
Choosing a player name.
After that, the phone shows whatever that game needs: a bingo card, answer buttons, and so on. Each game's own phone screen is covered in that game's guide.