The number of eCapsule keeps increasing/decreasing even after I purchased the unlock-package.

When you purchase an unlock package, you notice that generating new puzzles becomes possible even when the eCapsule count fell below the required level. (i.e. it will keep the gate open permanently) At the same time, Doku still keeps the business of eCapsule consumption/re-generation as usual. It is because eCapsule management via good performance and in duels is an essential part of the fun playing Doku.

Why should I lose an eCapsule when I stop in the middle of a session?

It functions as a mild mental barrier against skewing your speed record by selectively filtering out hard ciphers. It also counter-balances the rewards given whenever you improve upon your average time.

When I try to purchase an unlock package, Doku says it can not communicate with the App Store. This problem persists even when I have good internet connection and have been able to purchase items for other Apps.

You may need to follow the steps described here to diagnose the issue.

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