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Access
Boulder Roller is invite-only.
If you have a code, open app.boulderroller.xyz and choose Enter invite code, or tap Have an invite code? on the first iOS screen, and create your account. The code is used up at account creation; you will not need it again.
Without a code, choose Enter invite code, then Request access, enter your email address, and choose Request invite. The iOS app has no request form. Boulder Roller sends invitations by hand as places open.