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All types of booster speciallay choclates must have a storage button for future use in game when difficult level comes.
Challenge with friend should be time bound and moves done in the game online with two screens on going to check who win on tje bases of moves and time.
Challenge a Friend is already time limited @Auni460. Once you accept a Challenge, or someone accepts your challenge, you have two hours to complete the challenge.
Boosters can already be stored, in fact you don't get the choice most of the time. If you are asking for timed boosters to be storable then this isn't an idea that is allowed in accordance with the Master List of Ideas.