Offer beside a discovered place
Use a safe hub, journal, map, or chapter break after the player has explored enough to understand the item. Avoid placing a purchase prompt over dialogue, a reveal, or a route choice.
Protect story continuity
A bonus chapter or companion can extend the journey, but clues and main-story resolution advertised by the game must remain available. Explain exactly where the new content begins and how the player returns.
Verify world-state recovery
Purchase, cancel, reload, and revisit the entry point after another scene. Collected objects, dialogue choices, and open routes should remain unchanged unless the confirmed item explicitly affects them.
Follow the purchase through a story chapter
This story exploration game uses an adventure browser prototype centered on exploration, story gates, and collectible discoveries. Review the genre through offer beside a discovered place and protect story continuity. For a student team, the consumable boost should support that loop without becoming mandatory. Review the item through state the exact limit and consume only on activation. A student team can split the demonstration between the game loop, interface explanation, and classroom playtesting. The example offer is: A consumable boost preview with a concrete description and direct Koin price. This offer emphasizes a clearly bounded short-term benefit before expanding the catalog. Start before a conversation, discover a location, collect one clue, and reach a quiet journal or map screen before presenting the choice. Note dialogue decisions, discovered routes, chapter objective, and collectible count. Cancel and revisit the same characters to confirm that no branch or clue disappeared. Try insufficient Koin without closing the journal or moving the player. After a successful content or item choice, use the visible entry point from the map, quest log, companion screen, or collection. Finish another scene, reopen the game, and verify that the main-story route remains complete, the bonus scope matches its description, and the player never has to guess whether purchased content replaced an earned discovery.
Frame it as a design exercise
Use Koin as simulated game value and explain that the project demonstrates interface states and player choice. Do not collect card details, account credentials, personal information, or money for a classroom prototype.
Divide the demonstration clearly
One teammate can build the game loop, another can own interface wording, and another can run the playtest. Everyone should be able to explain why the item is optional and where it appears after confirmation.
Document what the prototype omits
List native billing, identity, durable storage, security, refunds, age rules, accessibility, and platform review as future production concerns. This shows technical understanding without pretending the browser project solves them.
Present both success and failure
During the demo, cancel once, attempt the item without enough Koin, complete a valid choice, and reopen the game. Explain which results are simulated and what would require real engineering in a released product.
Explain the system during a live demonstration
Prepare a short presentation that begins with the playable core activity, then shows a voluntary item preview, decline, insufficient Koin, valid confirmation, delivery, and reopening. Each teammate should explain one design reason and one technical boundary rather than reading the interface aloud. Include a diagram or note showing which values are simulated and which production systems are absent. Ask classmates to identify any pressure language, inaccessible control, unclear ownership rule, or privacy concern. Finish by describing how identity, durable storage, security, refunds, native policy, and testing would change a real implementation, without collecting personal or payment information during the exercise.
Account for every unit from purchase through use
Write the quantity, effect, duration, activation rule, stack limit, expiration behavior, and moment of consumption before presenting a Koin amount. A successful purchase should add inventory first; it must not activate merely because the player confirmed. Use one unit, interrupt the effect, finish a session, and reopen the game while recording remaining quantity and time. Repeat input during buying and activation to catch double subtraction. Compare ordinary progress, retry access, and failure recovery without the boost, then remove any design that makes the free route intentionally unreasonable. The player should always know how many uses remain, when an effect ends, and whether unused quantity survives another session.
State the exact limit
Show quantity, duration, activation rule, and the point when the consumable is removed. Players should know whether they are buying one use, several uses, or a timed effect.
Consume only on activation
Buying and using are separate actions. Add the item to inventory following the purchase, then reduce its quantity only when the player deliberately activates it.
Avoid failure pressure
Do not present the boost immediately after every loss or make ordinary progress unreasonable without it. The free retry and recovery path should remain understandable.