Make shure u have Glide LV.3, Quick Run at least LV.1 and High Jump LV.3 otherwise u cant do it, i did it with 4 millaseconds to spare so its not an easy task, i can tell u that in the beginning start of going to the left and get all those posters, then glide across the square and get the three posters on the one board, then the building in the middle of the square (next to the tram) has another set of 3 on it get those, then jump on the tram and up onto the roof of the building, and there is another set of three by then u should have gotten 9 or ten, and it should take u no more than 11 seconds, at that point u have about 2 seconds per poster, from then expirament, dont expect to do it just from ur first try, get the exact route that u think will work for u then do it over and over until u master it!!