This is my strategy. First, flip all the ones with no voltorbs. Then look for the ones that use only 1's to add up to the number, ex: (5 squares ok.) 3 voltorbs 2 coins. mark those with voltorbs. Because you need only 2's and 3's to advance. Last you look for the ones that use 2's and 3's to add up to the number, ex: (10 squares [1 row, 1 colum]) the row has 3 voltorbs and has 3 coins. the colum has 2 voltorbs and 5 coins. See what I meen. Its the ones that have no voltorbs that can help reveal to you the numbers.