It's been many years since I assembled playground equipment, but if I remember correctly, it was mostly nuts and bolts (meaning screws with hex heads) that held most of it together, some parts were probably screwed.
I don't remember the size of the nuts and screws, but you need a sharp knife or a pointed small flathead screwdriver or something similar to pry off the cap on the black plastic covers that are over each screw and nut.