One industrious coder has retooled Valve's Portal as a side-scrolling platformer for Texas Instruments graphing calculators, as shown in the video posted above.

Omnimanga and Reddit user "Builderboy" has created his take on a pocket-sized Portal Prelude for TI-83 and TI-84 calculators. It includes 38 test chambers to navigate, a portal gun to see you through and scripted dialogue that emulates the tone of the original title.

According to its creator, it took several years to code this nifty little game, which is available for download at Omnimanga.