Was very difficult. Had no understanding at the start and it didn’t help that there was basically no tutorial. I read that it was a fun game for building planes and spacecraft and that’s what I thought I was getting. But it turned out that you basically need a science degree to play the game because it is very difficult to even use the controls in building the rocket itself. Very dissapointed. Wish I could get my money back or have some way to play it more casually