Good on you psyker, keep at it! I did a 4x5 challenge in my record time and the following one I was over an hour! I find some puzzles are more difficult than others even though they are labelled the same difficulty. I have also found that it depends on where you put your attention that matters too. I had a difficult one where I could not go any further and quit it and tried again from the start. Guess what? I had it completed in 20 minutes almost without thinking. The puzzles are great, nevertheless.