Obviously they are getting more complex.
I'm still chugging away ... slowly but surely.
My average time per problem for each level is:
10: 28 sec
20: 88 sec
30: 109 sec
40: 119 sec
50: 122 sec
During the last 100 problems or so that I worked on, I gave myself two minutes before forcing myself to move. Sometimes I could work and solve the solution while other times, it took me a bit longer to figure out.
I'm getting a bit antsy ... I want to hurry up and finish this first round and then get started on hammering the L10 problems in my head.
This is going to be a long battle.