GliP: Great LED Interactive Puzzle

Check this out. Each block is made of a 8x8 RGB LED Matrix and a home-designed board based on a STM32 microcontroller running the FreeRTOS real-time operating system.

They are able to communicate through IrDA (infrared) connections and each board has four emitters and four receivers, one pair on each side. As shown, GLiP can be used as a puzzle game or the new position of a block can be automatically computed.