A mobile game is a game played on a mobile phone (feature phone or smartphone), tablet, smartwatch, PDA, portable media player or graphing calculator.The earliest known game on a mobile phone was a Tetris variant on the Hagenuk MT-2000 device from 1994. Today, mobile games are usually downloaded from an app store as well as from mobile operator's portals, but in some cases are also preloaded in the handheld devices by the OEM or by the mobile operator when purchased, via infrared connection, Bluetooth, or memory card, or side loaded onto the handset with a cable.