cells is the easiest lvl all you have to do is to first build a connection as fast as possibe to the cracks and put blasters like a little below that and then make the bottem all filled eith green your collecteros and wen you dont that build connections were the creepers are not in like the two lines and once those are up then build 6 mortors and put three on each side once there weak build blasters to push them back untill you nhook up the totems
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