A smile is a way of writing your thoughts on your face,telling others that they are accepted,liked and appreciated,so I smile just for you.
Puzzle is a very interesting thing to entertain. This is absolutely a mind game and you will get refreshed your mind after trying it. It may take only few minutes to complete if you are an expert in these kinds of games. But on the hand it might take some hour also if you are a beginner or you do not know about it more. There are a large number of games in the puzzles category like Sudoku, puzzler, etc.