Tetris, using the game’s popularity to drive purchases of the unit. The unit’s simple design meant users could get 20 hours of playing time on a set of batteries, and this basic design was left essentially unaltered for most of the decade. More advanced handheld systems, such as the Atari Lynx and Sega Game Gear, could not
its not a surprise to hear that the playing time for tetris was estimated at 20 hours because a game like that is designed to alluminate you and keep you occupied for longer periods of time.