Join the beta
Free. Two quick installs, about two minutes. Needs an iPhone with iOS 16.4 or later.
Nice to meet you at IAAPA Expo. Thanks for checking it out.
Guess the Coaster is iPhone only for now. Leave your email below and pick Android, and you'll hear first when it's on your phone.Email [email protected] with the subject "Keep me posted (Android)", and you'll hear first when it's on your phone.
On a computer?
Point your iPhone camera at this code to open this page on your phone, then follow the steps there.
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Get TestFlight
Apple's free app for trying apps before they're in the App Store. Install it, then come back to this page. Already have it? Go to step 2.
Get TestFlight -
Install Guess the Coaster
Tap the button, then Accept and Install in TestFlight.
Join the beta in TestFlightThe public beta opens in mid-November 2026.
Sign up below and we'll tell you when it opens.
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Play today's coaster
Open the app and tap Play now. No account needed. A new coaster every midnight, your time.
Want updates too?
Keep me posted (optional, you don't need this to play)
Hear first about new features (duels and crews arrive in the beta first), the App Store launch and Android. About one email a month.
Check your inbox
We've sent you an email. Tap the button in it to confirm, and you're on the list. Nothing there? Check your spam folder, or try again in a few minutes. If you've already confirmed this address before, you're all set and we won't send another.
Want to hear about new features, the App Store launch or Android?
Email [email protected] with the subject "Keep me posted".
Something not working? See Support.