To progress to the next stage, three keys are needed. You can unlock the cloud with help from your friends or by using jewels . To request them from friends, just click on the lock on the cloud and you will be prompted with a pop up with an option on how to open it.
keys are sent to you are credited to your account
when your friends send them to you, not when you check the message.
However, an account cannot have more than three keys at any given time,
so if you are maxed out, keys sent by your friends cannot be credited to your account.
If you repeatedly request keys from the same friend, you will not receive additional keys.
For example, if you request key from friend A at 11 o'clock and then at 12 o'clock,
the amount of keys will remain the same even if your friend accepts your request.
Also,If you closed the message box without taking the items (lives, coins, moves) from your friends when you start the game,
some of the items will disappear. As a result, please close the message box after you receive items.