Robotfindskitten
robotfindskitten is a free video game originally written by Leonard Richardson for MS-DOS. The game uses ASCII interface in which the player, as the eponymous robot and represented by a number sign "", must find a kitten on a field of other random characters.
Gameplay
Walking up to items allows robot to identify them as either kitten, or any of a variety of "non-kitten items" with whimsical, strange, or random text descriptions. It is not possible to lose. Simon Carless has characterized robotfindskitten as "less a game and more a way of life... It's fun to wander around until you find a kitten, at which point you feel happy and can start again".
Ports
The game has been ported to and/or implemented on over 30 platforms, including POSIX, the Dreamcast, Palm OS, TI-99/4A, the Z-machine, the Sony PSP, Android, and many more. Graphical versions, such as an OpenGL version with emblazoned on an otherwise featureless cube, also exist. Remakes are also used as programming tutorials, such as for Gambas.