well i made it on all 3 difficulties.... so i dont think its bugged.
do it as follows:
1st gren: 1st pipe, 2nd gren: chimney, 3rd gren: 1st pipe, 4th gren: second pipe
even though the "you own a 16mbit connection, how fast are your downloads"-question is wrong....
16Mbit = 16million bit
right answer in the quiz: 2000(somthing)MByte
1 Byte = 8bit.
so 16Million bit would equal 2000Million Byte and that is completely wrong.
correct would be: 16Mbit is (ca.) 2MByte