What is the name of the Lego product that snaps together with knobs? I remember owning a very strange Lego set, but have forgotten the name.

The pieces were similar to Technic parts, but different. They were green rounded frames and connected using purple squares with knobs. I do not recall them being able to directly connect to classic Lego bricks.

The set I owned was some sort of space ship. It came with a motor that made parts of it spin.

Any ideas?
I ended up finding my old instruction book. The parts were called Lego Znap.





It still blows my mind that these things exist.