I ran all 50 levels in 88 minutes of play time. Some I did fast, others caught me for a few minutes. This is for sure a good game to challenge those looking for a light brain teaser. It is the best copy of this type of game I have ever played, mostly because you find games like this on mobile and it's full of adds and stupid pop-ups. For someone new to training yourself with these puzzles, this is a great no pressure and no distraction start. Highly recommend.