Gemstone Vault and Stained Glass Puzzle mini-events are available for 2 days. You need to complete a series of levels in the respective mini-game. You can access the minigame via the special slot machine that will only appear on the map during the mini-event.
Gemstone Vault uses Match 3 game mechanics.
The mechanics of Stained Glass Puzzle are similar to Dream Kaleidoscope.
You can enter the mini-game using keys. If you lose the game, you lose a key. You can find keys at the Event location or purchase them with rubies. Once you have a new key, you can resume the game from the level where you lost.
As you progress, you will receive rewards for completing certain levels. You may be rewarded with Event currency, stars, and items for entering the Event location. The mini-event levels are different each time.