16 Of 24 Things Completed
Type in "1DT9M3DWP7Y163" and you will get16 of 24 completed.
Go to the parking garage level and go to the bowl. Start grinding around the edge and when you start to slow down, jump, do a 180, and grind again. (You will be grinding backwards) double tap up and you will speed up and start grinding forwards. You can collect as many points as you can by doing this.