It is NOT a game of skill or luck. The "game" is 100% riged to spend your money. After you have successfully finished a difficult level you may well get a few levels that are very easy but the you will get another impossible one to spend you money on. If you quit the game instead of buying extra help and not play for a day or so you will the have more success but will still not complete the level without purchases. Repeat this several times, always not playing for a couple of days and then one day you will magically be rewarded with a never ending supply of boosters that keep raining down for no apparent reason. Once you have completed this once impossible level you will get a few more easy ones to boost your morale, and then it's back to impossible. IT'S 100% RIGGED - DON'T WASTE YOUR MONEY!!