The Gemstone Vault event lasts for two to three days.
You need to consecutively complete a series of levels of a special match-3 game.
You can enter the game using keys. If you lose the game, you lose one key.
You can find keys in the event location or buy them with rubies.
Once you have a new key, you can resume the game from the level where you lost.
You get the prizes for completing certain levels as you progress.
You may get event currency, stars, and items for entering the event location as a reward.
The mini-event levels change every time.
You can enter the game via a special slot machine, which appears on the map only during the mini-event.
