Puzzle 8 is the removal of the vines that cover the wall on the east side of the village. After you purchase Level 3 of Culture Tech and have completed Puzzle 4, drag a villager to the vine-covered wall and they will begin cutting away the vines...

Okay, maybe I have been playing this game too long today and my brain is too foggy, but where is this wall? I can't seem to find it and I have level 3 of culture and have completed puzzle 4.

Thanks~

On the bank of the stream running from the pond to the dam.

Thank you, I did find it shortly before reading your post. I think my brain was just overthinking it!