Design install and browser modes
For a game designer, this catalog design prototype should make every player action and result the player can inspect easy to evaluate. Write how to define item identity, value, Koin price, preview, and ownership before checkout. Choose the offer moment, explain the game benefit, and protect the complete free path. Compare the experience before and after ownership. Try the flow in a regular tab and an installed presentation. Navigation, focus, and recovery should remain understandable even when browser controls are reduced or the app resumes from suspension.
Treat offline state explicitly
An unavailable connection must not look like a completed purchase. Explain when the action cannot continue, preserve the game state, and provide a safe retry after connectivity returns.
Do not imply native entitlement
PWA installation does not create platform IAP ownership. Durable identity, cross-device state, refunds, billing integration, and app-store policy remain outside the browser prototype.
Judge the offer in the core loop
Run the game without opening the purchase choice, then run it with the item. Compare pacing, motivation, difficulty, and recovery so the offer supports play instead of repairing frustration that was added deliberately.
Make the player promise concrete
Describe what changes on screen, how long it lasts, where it appears, and what remains available without it. Replace value labels such as better or premium with rules a player can observe.
Review the moment of choice
Check what the player was doing immediately before the offer and where cancel returns them. The item should arrive after enough context to understand it, but never during a time-critical or emotionally pressured action.
Compare items consistently
Use the same fields for every offer: preview, benefit, ownership or duration, full price in Koin, and owned state. Consistent cards make differences easier to understand. Test that behavior using PWA games. PWA packaging does not create native platform IAP entitlements.
Keep the first catalog small
Start with one to three clearly different items. A large grid makes it harder to find unclear value, duplicated promises, and missing delivery states. Test that behavior using PWA games. PWA packaging does not create native platform IAP entitlements.
Design owned and unavailable states
A catalog also needs sold, owned, equipped, and unavailable presentations. Do not leave a purchased item looking buyable after reload. Test that behavior using PWA games. PWA packaging does not create native platform IAP entitlements.