You can check your luck by opening the Treasure Cheat by the key that you obtain by Daily Bonus, Gift From Friend, spending my own chip to convert into Bronze, Silver, Gold Key.
When you open the chest you have chance to win certain chips or Item which you can collect.
When you complete certain set of Items listed then you can convert it into Bigger size of chips as compensation.
This is purely for fun just like Slot so there is no guarantee of winning all the time.
It could be useful when you have alot of friends and they send you Key as gift then you can check your luck many times.