Now go up the spawn point stairs. There is a closed area next to the Ninjago City Docks Story access point. Open it with enough Bricks. Go down and open the box with a Spear.
Also here, last one in this closed area, there is a terminal where you use Nindroid Hacking. Go in and push the button 3 times. First time, thugs are coming out, second time a Big Stud and last the Gold Brick.
Now we're going back to where we built the Yeti Truck. There is an open shop next to the quest giver. Climb up onto the roof. There is a little yellow rail on the wall. Walk along it and climb up.