2048

While not as large as the Sudoku playing space, 2048 has charm in its limitations and the illusion of space. It starts off feeling pretty empty but you'll be caught off guard by just how quickly the tiles fill up. It gets to the point where you're constantly hoping that there will be at least one tile free to allow for some movement. It's challenging your sense of strategy in a very restrictive space where every move has the potential to make or break your stride. All you can do is try to clear a path to victory.