Mass Attack is extremely player-friendly, meaning these are little instructions to follow but big chance to win. What you need to do is to become a mouse virtuoso while adjusting balls' weight.
There are two scales with ball plummet(s) on one of them. Your task is to make both scales equal. It can't be that difficult after several tries but there is one thing you are to know about Mass Attack - there are several games
in one level and you aren't allowed to start the game from the moment you failed, instead to start playing from the beginning of the level. It's a real challenge especially for those who aren't lucky during playing and have to start the save level again and again.
You have three attempts to make uneven scales equal. Use your mouse to 'grow' balls: the longer you are holding the button, the large ball you'll get. Once you tried too hard and overdid weight, you can add a ball or two to where it is needed. Overall you have three balls, thus these are three tries. Maximum difference is certain for a definite level: the easier level is the bigger the difference you may have. Good luck and let your maximum difference be always zero!