guide for the last stage: dont build straight forward!!! first build a chain of collectors to the left and at the end 1 blaster (on the position where the blue thing comes over the edge), next part is to do the same thing to the right hand side. THEN build a chain straight forward, collect the things and put a mortar at the end of the chain. now u r save for a while. build as much collectors as u can. later on build reactors. with enough energy u can beat the enemy and get the artifacts.
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