There are 15 all together but i have ps3 but it's the same so don't woorry the best way too find them is too stay on rooftors and look around with the camera also there are 1 jump challenge on the Empire State Building the strak tower and there is a funny building with a slope sprint up it and jump and there is a jump callenge just as you jump off it hope i could have been of some help.
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just go to menu then maps and find your Jump challenge look at all the buildings till you find one i have it for PC but its all the same so bye bye
You jump at the building and press the down button on the control pad.
The ninth jump challenge is south of Time Square near jump challenge 8, slightly further south between a skyscraper and a smaller building, down low. The fourteenth jump challenge is Southeast of the Empire State University Subway.
do you have playstation or xbox 36o
You do the challenges, find the sweets and then jump down to the zombies. Its kind of simple.