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×After you step over the trapdoor, tar needs to grow 5 times to let you through. Then the lemming needs to bite the bomb.
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×You need to put the golem rubble in the correct spaces to a) guide the lemming and b) prevent unkillable tar babies forming.
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× b) should be simple to work out if you just cross the trapdoor, wait 5 cycles, and see where there are babies that can't get into bomb range. Put rubble where they form.
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×The lemming has to hang around for 150 turns. That's too long for a single path, so it'll need to be in a loop that gets disrupted by the tar growth.
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×It's a right turning lemming, so if it enters a "left turning" corner, it'll turn around instead. You can use this to make a holding pattern with minimal rubble piles.
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×You want to interrupt the lemming's loop on the 4th growth cycle.
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×One baby blocking rubble is part of the loop. Use another rubble pile to complete the loop, and one more to direct it to the bomb.