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Level 7931 is classified as a hard level so you can expect to lose some lives before you manage to pass it. This is a dual task level, you have to collect the blockers and clear the jelly to complete the level. There are order locks on the level which need to be unlocked to complete the level. First you need to collect the keys to unlock the spawner in the middle of the board. The spawner will give you the sugar coats to open the fist order lock, this will unlock some of the blockers to open the next lock. Eventually the whole board will be unlocked and you can clear the remaining jelly