Use the build phase
Show an offer before a wave or after rewards are counted, never while enemies are moving and towers require attention. The player should be able to inspect the lane and dismiss the choice calmly.
Keep tower roles readable
Preview range, target rules, duration, or visual-only status with the same symbols used in play. Avoid selling an unclear boost that makes wave balance impossible to understand without purchasing it.
Run the next wave twice
Compare the free path and owned state against the same wave. Cancelling the action and reload must preserve placed towers and earned currency, while the delivered item appears only in its promised build or inventory slot.
Use one wave as a repeatable purchase test
This tower defense game uses a tower defense browser prototype centered on wave planning, tower roles, and upgrade timing. Review the genre through use the build phase and keep tower roles readable. For a indie studio, the content unlock should support that loop without becoming mandatory. Review the item through describe the included content and open a visible entry point. An indie studio can divide timing, interface, implementation, and failure testing among named owners. The example offer is: A content unlock preview with a concrete description and direct Koin price. This offer emphasizes a durable, understandable extension to the core experience before expanding the catalog. Prepare a map with a fixed tower layout, earned currency, incoming wave, lives, and upgrade choices. Open the item only during the build phase, cancel, and verify that placement and targeting rules remain intact. Try insufficient Koin without starting the wave or consuming game resources. Complete the valid choice, place or equip the delivered result, and run the same wave used by the free version. Compare range symbols, target priorities, visual clarity, and outcome without hiding balance changes. Then restart or reopen at the next build phase and check that towers, rewards, ownership, and Koin reconcile once. The game should not require the item to repair a wave made unfair on purpose.
Give each discipline one decision
Design owns the offer timing and free path, UI owns readable states, engineering owns state transitions, and QA owns failure coverage. Agree on the same item definition before anyone creates implementation tickets.
Review the playable flow together
Use the prototype in a short team session and walk through decline, insufficient Koin, pending, success, delivery, and reopening. Resolve player-facing disagreement in the build instead of leaving it inside separate documents.
Turn states into production tasks
After the journey is approved, split identity, durable ownership, native billing, security, refunds, policy, localization, accessibility, and analytics into explicit work. The prototype should not be treated as proof that those systems exist.
Keep QA independent of the happy path
Have a tester interrupt confirmation, repeat an input, change screens during delivery, and reload at several points. Compare the result with the agreed item promise and reject duplicate grants or unexplained Koin changes.
Turn the review into an owned team decision
Schedule a short session with design, UI, engineering, and QA using the same playable link and item definition. Assign one person to operate while the others record disagreements about timing, wording, delivery, fairness, and recovery. End with an explicit decision for each disputed state and name the owner of every native implementation task. Update the prototype or source brief before tickets spread outdated assumptions. QA should then write independent scenarios from the agreed player promise, including interruption and duplicate input. This creates a shared reference without mistaking the browser build for a backend, billing integration, revenue forecast, or release approval.
Trace the promised content boundary
Name the exact level, chapter, quest, character, route, or mode, describe its approximate scope, and identify the visible entry point that will open after confirmation. Complete the advertised core path without it and verify that essential clues, main-story resolution, required accessibility options, and ordinary progression remain intact. Buy the unlock, start it from the map or menu, leave midway, and find it again after reopening. Confirm that ownership replaces the locked treatment and does not require another Koin deduction. Review age context, rights, moderation, localization, save compatibility, and whether the public description overstates length or replay value. Bonus content may extend a complete game; it should not reveal that the promised game was unexpectedly incomplete.
Describe the included content
Name the level, chapter, quest, character, or mode and explain its approximate scope. Players should understand what opens before they confirm.
Open a visible entry point
Once success is confirmed, replace the locked state with an owned state and a clear way to start the content. Preserve that entry point after reload.
Keep the promised game complete
A bonus path can extend the experience, but the core ending and advertised main game should not disappear behind an unexpected purchase.