There is no sound.

Turn on "BGM" and "SE" in the System > Optional Settings menu.
If your device is in silent mode, sound will not play even if the setting is on, so make sure to turn off silent mode.

※On some devices, after completing the above settings, you need to press the volume key and exit the option settings menu before the settings take effect.

I bought a gold bag but it doesn't register.

Gold bags are items, so you need to sell them at the shop to exchange for money.

I bought jewels, but they don't register.

Check your mail to see if the Google Play purchase details mail has arrived.
Also confirm that your device is in an area with a good network connection and try rebooting your device.

※Depending on your device and circumstances, it make take up to 1 hour to process.
Try rebooting after a period of time.

Nothing appears on the screen.
A white screen appears.
The screen is not displayed correctly.

It is possible there is not enough memory.
First close other applications, and then try restarting the app by force closing it.
In the event that it still does not work, please contact us.

The app isn't working right after an update.

First close other applications, and then try restarting the app by force closing it.
In the event that it still does not work, please contact us.