Flow Free is a very simple game but after a few levels it becomes addictive and more challenging. The game starts off very simple of you just needing to connect two points and fill up the whole board. As you keep going further into the different levels it becomes more difficult with the amount of points that need to be connected increase or decrease without crossing lines but also without leaving any space empty. This game is great for a commute to work but I do need to warn you as you might miss your stop when you really get into it. This game is also great as it makes your brain work but at the same time relaxing at the end of the day.