I remeber the first one I had. My cousin had one from camp so I started playing with it. I just remeber leaving it on my dresser and continued to solve it the next day. I believe it took me a week. I'm not that good with math but those things are fun!
Also those things are great for when you don't want to be somewhere or just need some peace.
Also those things are great for when you don't want to be somewhere or just need some peace.