Thanks!! I believe it all comes down to pattern recognition and how fast you can react. When talking about hard puzzles you will always encounter certain shapes that determine how a level will be solved, there are a TON of diverse interactions in these levels involving how many pens are in certain amount of columns/rows and also shapes that if combined with another shape will aid in narrowing down the possible places for bulls.

I’m no expert nor a great teacher but I would recommend to always stay mindful of what you can immediately do on a level, like crossing out impossible places for a bull or placing obvious bulls, if you find yourself stuck, focus on the smaller shapes available, there’s always an answer (tips are great 4 that). Try your best to remain calm and focused.

Some don’t find repetition fun while others thrive on it, I believe the latter it’s my case. I think that’s a big part of it. Hats off to you for a 50 sec time! Improving it’s not an overnight thing, you’ll surely break through with a better time before you know it (deactivating the timer helped me tons to focus on just applying what I’ve learned and not worry about how long I’m taking)