Tandy Stack Challenge

The Tandy Stack Challenge (also branded as the Radio Shack Stack Challenge, Model 60-2247) is a vintage handheld electronic LCD game released in 1991 that functions as an unofficial Tetris clone. Produced by Tandy Corporation and sold through Radio Shack retail stores, the device became a popular retro gaming staple due to its unique physical design and surprisingly robust audio.

While it plays identical to classic Tetris, this version is widely considered by retro enthusiasts to be uniquely difficult due to a highly aggressive random block generation algorithm.