Indie studio plan
Give design, UI, and QA one shared item definition. Everyone should use the same benefit, duration, Koin price, and ownership rule.
Indie Studio guide · Card Battler · Direct Koin item
How an Indie Studio Can Add a Koin Convenience Upgrade to a Card Battler Game
Build the card battler game first, then add one optional convenience upgrade that supports the existing play loop. This guide keeps the item understandable from its first preview through delivery and reload.
Create this game flow
Plan the convenience upgrade around the game
Why it fits card battler
A card battler browser prototype centered on deck identity, readable rarity, and strategic counterplay.
What the item offers
A convenience upgrade preview with a concrete description and direct Koin price.
A practical card battler example
Offer moment
Place the convenience upgrade after this loop advances: a card battler browser prototype centered on deck identity, readable rarity, and strategic counterplay. Wait for a safe pause. Player progress must not depend on the offer.
Offer card
Offer-card rules: Avoid ambiguous rarity promises; Show the before-and-after limit. Show the item, benefit, ownership or duration, balance, and full price in Koin. Keep confirm and cancel separate.
Successful result
Test preview, confirm, insufficient balance, success, apply the durable convenience entitlement and show the changed limit, and reload. Show that change inside normal play instead of relying only on a success message.
Free path
Test a free session around a card battler browser prototype centered on deck identity, readable rarity, and strategic counterplay. If play becomes incomplete, fix the game before changing the offer.
Design the convenience upgrade in detail
Use the collection boundary
Show the item in a deck editor, reward summary, or collection screen, never over a timed turn. Players need space to compare ownership, quantity, and deck legality before confirming.
Avoid ambiguous rarity promises
Name the exact card, cosmetic treatment, or content unlock instead of implying a random competitive advantage. If the item is visual only, keep its stats identical and say that plainly.
Validate deck state
After delivery, add the item to the correct collection and enforce copy limits. A player cancellation, too little Koin, and reload should preserve the current deck list without inserting, removing, or upgrading unrelated cards.
Verify collection ownership and deck legality
This card battler game uses a card battler browser prototype centered on deck identity, readable rarity, and strategic counterplay. Review the genre through use the collection boundary and avoid ambiguous rarity promises. For a indie studio, the convenience upgrade should support that loop without becoming mandatory. Review the item through show the before-and-after limit and treat the upgrade as durable. An indie studio can divide timing, interface, implementation, and failure testing among named owners. The example offer is: A convenience upgrade preview with a concrete description and direct Koin price. This offer emphasizes less friction while preserving the playable free path before expanding the catalog. Start with a saved deck list, collection quantities, active format, reward history, and selected cosmetic style. Open the choice from the collection screen after a match, cancel, and confirm the deck remains byte-for-byte equivalent in visible terms. Try insufficient Koin without inserting a placeholder card. Complete a valid named card, visual treatment, or content unlock and apply copy limits and format rules immediately. Play a match, return to the editor, and reopen the game. Check one ownership grant, stable deck contents, unchanged earned rewards, and no random rarity implication. Visual-only items must keep statistics identical, while competitive access remains understandable for a player who declines.
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.
Prove the improvement without manufacturing discomfort
Display the current capacity, preset count, queue size, travel option, or workflow limit beside the precise improvement and show whether ownership is permanent. Play a representative session without it and record whether storage, repetition, waiting, or navigation already feels intentionally designed. If the free experience is cramped or slow only to sell relief, repair that baseline first. Complete the choice, apply the new limit in its normal screen, fill or use the added capacity, and reopen the game. The higher limit should remain visible and should never appear buyable again for the same account state. Check that cancelling the action preserves existing configuration, insufficient Koin changes nothing, and the upgrade helps without turning ordinary progression into a penalty.
Show the before-and-after limit
Display the current capacity or workflow and the exact improvement, such as additional inventory slots or another saved preset.
Treat the upgrade as durable
Following the purchase, apply the new limit visibly and preserve it after reload. Do not make the player buy the same permanent improvement again.
Remove artificial friction
Test the game without the upgrade. If normal play feels deliberately slow, cramped, or repetitive only to sell relief, improve the free experience first.
Build it in five steps
1. Finish the card battler loop
Make the main activity playable before adding the convenience upgrade. Players need context to judge whether the item is useful.
Result: A working card battler foundation
2. Write one item definition
A convenience upgrade preview with a concrete description and direct Koin price. Keep the same wording in the preview, confirmation, and delivered state.
Result: A consistent player promise
3. Generate the purchase choice
Show the exact Koin amount, balance before spending, confirm, cancel, and what ownership means. Design chooses the offer moment, UI makes every state distinct, and QA tests transitions and recovery. Use the playable prototype during the team review.
Result: An understandable decision
4. Deliver and recover
Test preview, confirm, insufficient balance, success, apply the durable convenience entitlement and show the changed limit, and reload. Then test too little Koin, a player cancellation, repeated input, interruption, and reload.
Result: A visible, stable result
5. Test as a indie studio
Write test cases for a Koin shortage, cancelling the action, delayed delivery, repeated input, and reload. Create production tickets only after the player journey is agreed.
Result: Indie studio plan
Generate it in SEELE
Prompt 1
Create a browser-playable card battler game prototype for a small indie studio. Build the core loop around deck identity, readable rarity, and strategic counterplay. Add one optional convenience upgrade offer containing an inventory expansion with before-and-after capacity, Koin price, and persistent owned state. Price it directly in Koin, require an explicit confirmation, show the balance effect, and apply the durable convenience entitlement and show the changed limit. Do not add subscriptions, external payment checkout, revenue reporting, or guaranteed earnings. Include insufficient-Koin, cancel, success, and reload states.
Prompt 2
Keep the item optional. Show its clearly stated Koin cost, available Koin balance, confirm, cancel, low-balance, success, visible delivery, and reload states.
Indie Studio playtest checklist
- The convenience upgrade supports the existing card battler loop.
- The item benefit and ownership rule are clear prior to confirming.
- The specific Koin amount and Koin balance now appear together.
- Cancelling the action returns to play without loss or pressure.
- Success visibly delivers the confirmed convenience upgrade.
- Write test cases for a Koin shortage, cancelling the action, delayed delivery, repeated input, and reload. Create production tickets only after the player journey is agreed.
Before you publish
- Avoid this design problem: turning ordinary play into artificial friction that exists only to sell relief.
- This guide uses a direct Koin transaction for one optional game item. It does not create a subscription or recurring charge.
- The result is a browser-based playable build. Native billing, identity, durable entitlements, security, refunds, and store approval need separate implementation.
- SEELE does not provide payment analytics, tax tools, payout reports, or guaranteed revenue through this flow.
Frequently asked questions
What should this card battler offer contain?
A convenience upgrade preview with a concrete description and direct Koin price. Start with one item and one price.
Is this a subscription?
No. The player spends Koin directly on one named item or unlock.
What happens if the player cancels?
Return to the same game state without spending Koin or delivering the item.
What if the Koin balance is too low?
Explain the shortage, preserve progress, and do not deliver the item.
Does this include payment or revenue reports?
No. It covers the player-facing purchase experience, not financial reporting.
Is the prototype ready for a native store?
No. The browser prototype still needs native billing, persistence, security, refunds, and platform approval.
Build this card battler purchase flow
Open the complete prompt in SEELE, adjust the item and Koin price, then generate a playable version you can test.
Open this prompt in Workspace