The puzzle category of games is so huge. From jigsaws to hidden object games, it's possible to like one type of puzzle game and dislike another. Many years ago, the puzzle game Tetris introduced the idea of fitting a variety of geometric shapes together to produce a continuous line that would disappear. This type of puzzle game makes you think about the position and shape of each falling object and how they collapse into another to form lines. To be good at Tetris, you have to constantly think about how the shapes fit together.