When I was young and would visit my grandmother, the park there had some climbing structure made out of steel tubing with a big rope lattice inside. At the time it felt quite massive though trying to guess now it was perhaps 4.5-6m tall at the top. The ropes were pretty dense inside but it was this reverse-hourglass shape so it was pretty easy to go to the edge and not have a bunch of ropes underneath you.

I’m amazed as an adult that that thing was allowed but it was pretty fun at the time and I’d guess not actually that dangerous.

Remembering back those were awesome. Can't image what our parents thought.

I was curious and looked it up. In Germany climbing structures may have a "fall height" of up to 3 meters. They can be much higher, though, since the fall height is only counted to the next rope layer. Basically, the ropes will slow down your fall is safe enough.

I believge the name you're looking for is Jungle Gym (non-UK) or Climbing Frame (UK). In portuguese we call them trepa-trepa ("climb-climb") which I think is quite fitting.

I didn’t really want to give it a name because a climbing frame is something smaller than this thing in my mind.

Or simply a playground.

When I was 9 or 10 I went with some friends and their parents to a park that had a massive tree that was very easy to climb. Two of the boys and I hopped on and just kept going. Finally turned around either because we were shouted down by their parents or because one of us finally had some sense.

Later on that day, a girl from their family was climbing on a low branch (maybe 2m off the ground), fell, and seriously messed up her ankle or knee. She was on crutches for a while.

The boys and I must’ve been somewhere between 8 and 12 meters off the ground. In retrospect it’s one of the most dangerous things I’ve ever done, and I’ve done multi-pitch trad climbing.