There are many variations of this game. The main object is to connect all dots but the lines may not cross each other.

Sometimes the puzzles can be quite hard, but if you have solved a few you will find some patterns with which you can solve them quit easily.

I find the puzzles fun to do. You will also find variations of this game, eg not squares but hexagons but it doesn’s change the puzzle. Another variations is a version where there are bridges allowing the lines to cross. I find those variations less fun than the original.