The player may spend the currency to purchase items or abilities that allow the player to earn the currency faster or automatically, without needing to perform the initial action. In an incremental game, players perform simple actions – usually clicking a button or object – which rewards the player with currency. Mechanics Progress without interaction, or very limited interaction In some games, even the clicking becomes unnecessary at some point, as the game plays itself, including in the player's absence, hence the moniker idle game. This ' grinding' earns the player in-game currency which can be used to increase the rate of currency acquisition. Incremental games, also known as clicker games, clicking games (on PCs) or tap games (in mobile games), are video games whose gameplay consists of the player doing simple actions such as clicking on the screen repeatedly. Video game type Progress Quest (2002), considered the first idle game