How billing works
One-time unlocks (Pro, Storm Shelter). Pay once via the App Store, keep forever. The purchase is tied to your Apple ID — install Cardio Command on a new Watch or iPhone, hit Restore Purchases, and you're back where you were.
No subscriptions. A subscription is hard to justify for a game with no ongoing server-side content cost. You pay once and the mountains stay unlocked — full stop. Future content (additional mountain packs, seasonal challenges) will be separate optional purchases if and when they ship.
No accounts, ever. All purchases ride your Apple ID. We never ask for an email, password, or payment details directly. We can't see your billing information and we never will.
Storm Shelter and Pro. If you buy Storm Shelter and later upgrade to Pro, the App Store credits the $1.99 — you only pay the difference. If you buy Pro first, Storm Shelter is already included; nothing extra to purchase.