Haha .. The list of amazing things you can do with a TI-83 calculator just got a little longer! This is a video of Portal Prelude, a Portal fan game by Builderboy2005 for the TI-83 Plus and TI-84 Plu... Portal on a Texas Instruments calculator!
Brilliant work! Far cry from the days when we used to amuse ourselves by putting things like HELLISH into the display.