This is a "casual game". They have similarities in that they are designed for people like your mother who doesn't know anything about computers, and are almost all simple point and click adventure games. They are usually centered around doing simple puzzles and have very little depth or complexity and no loss state. This means that most of these games are actually simpler then the adventure games with 3D environments released a few years ago. Also, nearly all of them let you unlock screensavers, desktop wallpapers, and braindead commentary from the creators about how hard it was to create the game.