Four or more video games were made by Naughty Dog.
 The introduction of walking simulators (adventure games that allow for exploration but lack any objectives) like Gone Home, and empathy games (video games that tend to focus on emotion) like That Dragon, Cancer brought the idea of games that did not have any such type of winning condition and raising the question of whether these were actually games
 Popular casual games include Tetris and Candy Crush Saga

