The shirt was made for the game's 30th anniversary last month, and involved the use of 128 LEDs and 4AA batteries, according to Kerger. There's an Arduino Uno under the shirt.
Kerger cites an earlier LED hack of a pumpkin as inspiration for his project, making use of 128 LEDs, an Arduino Uno microcontroller board, 3D-printed housing, and materials for the buttons, as well as two Adafruit Matrix controllers.
"Here is a project I just finished, just in time for the 30th anniversary of Tetris. a T-Shirt you can play. with an Arduino Uno, 4 AA batteries and 128 LEDs. I always wanted a playable T-shirt, well now I made one myself. Based on the pumpktris instructables," he says.
In addition to the actual hardware components, Kerger has also designed the T-shirt to feature visual elements that correspond with the embedded hardware controls and outline the play area.
It's not the most ideal of angles to play from (and you can't actually buy one yet), but at least this is a wearable we'd actually use.