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Two phones.
One night.

1. Open After Dark on each phone. One creates the pair; the other joins with its invitation.
2. Save your own recovery key privately. Never share it; your partner has a different key.
3. Choose a nightly level and route length. Answer your private list. Only Yes from both phones enters the route.
4. Press START when both lists are locked. Read your own screen. Either phone can pause or skip; both agree to resume.
5. Finish with your private reflection. Return in the same browser, or recover this phone with your own key.